Hahderia, Yorterrie's 1st stage evolution.
Reparudasu, Choroneko's evolution.
Baokki, Baoppu's evolution.
Hiyakki, Hiyappu's evolution.
Zebraika, Shimama's evolution.
Kokoromori, Koromori's evolution.
Dakkora, a Fighting-type Pokémon holding a wooden plank. It has two evolutions.
Otamaro, the tadpole Pokémon. It has a Water-typing which changes into Water/Ground when it evolves.
Dageki, the Judo Pokémon.
Hahakurimo, Kurumiru's final evolution.
Fushide, a Bug/Poison centipede.
Hoiiga, the evolution of Fushide, the centipede Pokémon.
Ishizumai, the Hermit Crab Pokémon. Bug/Rock.
Zuruggu, the Dark/Fighting Pokémon.
Shinporah, the Flying Mask Pokémon. Only one eye, two golden wings without feathers. Psychic/Flying type.
Desumasu, Desukan's pre-evolution.
Yabukoron, the Garbage Bag Pokémon. It is a pure Poison-type.
Gochimu, Gochiruzeru's first pre-evolution.
Yuniran, Rankurusu's first pre-evolution.

Clearer picture of Hatooboo, the evolution of Mamepato.
Gamgaru, the 1st evolution of Otamaru.
Koaruhii, the pre-evolution of Swana.
Warubiru, the 1st evolution of Meguroko.
Erufuun, Monmen's evolution. It evolves using a Sun Stone. (I used a different source because the picture is clearer there).
Bachuru, Denchura's pre-evolution.
Kaburumo, a new Bug-type Pokémon.
Banipucchi, the Ice Cream Ball Pokémon. A white/blue ice cream ball with tiny body, almost like a baby. Pure Ice type.
Doredia, Churine's evolution.
Marakachi, the Cactus Pokémon. It is a pure Grass type and has the ability Water Absorb.
Gantoru, Gaigaiasu's pre-evolution.

Dotetsukotsu. the evolution of Dokkorar.
Pururiru, a new Pokémon.
Shibishirasu, the Small Lamprey Pokémon. It has a pure Electric typing.
Pendora, the final evolution of Fushide.
Purotage, the Archelon Fossil Pokémon. It is Water/Rock.
Yanakki, the evolution of Yanappu.
Aken, the Archaeopteryx Fossil Pokémon. A bird with yellow, red and blue feathers.
Tesshido, the Iron Ball Pokémon. It is Steel/Grass.
Kurumayu, the middle evolution of Kurumiru.
Rigurii, Green/Blue Alien Pokémon. Pure Psychic type.
Chobomaki, a new Bug-type. It is a clam with red body and a helmet shell.
Gobitto, the Hexagonal Mirror Pokémon. Front part of mirror features an angry face full of hate. Pure Ice type.
Hitomoshi, the Ghost Candle Pokémon. Fire/Ghost typing.
Murrando, the final evolution of Yorterrie.
Gomoniru, the pre-evolution of Gochiruzeru.
Kunhorou, the final evolution of Mamepato. It also has an alternate form which depends on the gender. The first one is male while the second one is female.
Daburan, the pre-evolution of Rankurusu.
Baniricchi, the evolved form of Banipucchi.
Nageki, the counter-part of Dageki.
Kumashun, a baby polar bear with a giant blue snot. It is a pure Ice-type Pokémon.

1st Gym: Dento, Poddo, and Kon - Grass, Fire, Water - Tri Badge - Sanyou City. All Pokemon up to Level 20 will obey.
2nd Gym: Aloe - Normal - Basic Badge - Shippou City. All Pokemon up to Level 30 will obey.
3rd Gym: Aati - Bug - Beetle Badge - Hiun City. All Pokemon up to Level 40 will obey.
4th Gym: Kamitsure - Electric - Bolt Badge - Raimon City. All Pokemon up to Level 50 will obey.
5th Gym: Yakon - Ground - Quake Badge - Hodomoe City. All Pokemon up to Level 60 will obey.
6th Gym: Furou - Flying - Jet Badge - Fukiyosa City. All Pokemon up to Level 70 will obey.
7th Gym: Hachiku - Ice - Icicle Badge - Sekka City. All Pokemon up to Level 80 will obey.
8th Gym: Iris (exclusive to Black) / Shaga (exclusive to White) - Dragon - Legend Badge - Souryuu City. All Pokemon will obey.

Shikimi is the the first Elite 4 member. She specializes in the Ghost type, and has a Desukan (Lv.48 ), a Burunkeru (Lv.48 ), a Goruggo (Lv.48 ), and aShanderaa (Lv.50).
Giima is the second member of the Elite 4. He uses Dark-type Pokémon and his team consists of Zuruzukin (Lv.48 ), Warubiaru (Lv.48 ), Reparudasu (Lv.48 ), and Kirikizan (Lv.50).
The third member of the Elite 4 is Katorea, who specializes in Psychic-type Pokémon. She has a Rankurusu (Lv.48 ), Musharna (Lv.48 ), Shinborah (Lv.48 ), and Gochiruzeru (Lv.50). She's also one of the Frontier Brains in Sinnoh (called Caitlin in English).
The final Elite 4 member is Renbu, who has a Fighting-type team made of  Nageki (Lv.48 ), Dageki (Lv.48 ), Roopushin (Lv.48 ) , and Kojondo (Lv.50).
The champion is reported to be Belle. Her team consists of Muurando (Lv.66), Yanakkii (Lv.66), Musharna (Lv.66), and Enbuoo/Jaroda/Daikenki (Lv.70). Your choice of starter will determine her last Pokémon. 



Shikimi





Giima





Katorea 





Renbu

There are 6 HMs in the game: Cut, Fly, Surf, Strength, Waterfall, and Dive.
This is your in-game mother.
There are only 8 Pokémon boxes in the PC. It's possible that more boxes will appear once you defeat the Elite 4 and get the National Pokédex, since that is a low number of boxes.
Tsutarja evolves into Jyanobii at Level 17.
Baoppu and Munna can be caught in the Abandoned Lot of Dreams.
Burn Up is a new, physical Fire attack with a base power of 50, accuracy of 90, and PP of 20.
A new TM called Vengeance replaces the previous TM67 Recycle from Generation IV. You get it once you defeat Aloe, the Normal-type gym leader.
A new TM called Volt Charge replaces TM72 Avalanche from Generation IV. It is a special attack, has a base power of 70, accuracy of 100, and PP of 20. You get it once you defeat Kamitsure, the Electric-type gym leader.
Aati, the Bug-type gym leader, uses a Hoiiga (Lv.21), Ishizumai (Lv.21), and a Hahakomori (Lv.23). When you defeat him, you get TM76, which is a new attack called Bug Resistance.
Kamitsure, the Electric-type Gym Leader, uses two Emonga at Level 25 and a Zebraika at Level 27.
Zorua evolves into Zoroark at Level 30.
Furou, the Flying-type gym leader, uses a Kokoromori at level 33, Kenhorou at level 33, and Swanna at level 35.
[NEW] You find Purotoga and Aken (the fossils) in Rizoodo Desert after defeating the third gym. You can then revive it in Shippou City.
[NEW] Although the purpose is not known yet, your Trainer card lists your own Nature.
[NEW] Sinnoh's Champion, Cynthia, is in the Isshu region. She asks you for a battle, and has a team of Spiritomb, Milotic, Garchomp, Lucario, Wooguru, and Shibirudon. She comes during the spring and summer only, but you can battle her many times. (I thought they said there's not going to be any old characters in the games?)
[NEW] A new area called the Seabed Ruins is accessible by Dive, and has weird symbols all over the walls.
[NEW] Investigator Looker makes a return in Black and White. (Again, I thought they said there's not going to be any old characters in the games?)
[NEW] You are able to store 720 Pokémon (equivalent to 24 boxes) in the PC after a certain point.
[NEW] A new Champion called Adeku challenges you after the Elite 4 rematches. He has an Agirudaa, Buffalon, Kurimugan, Baibanira, Shubarugo, and Urugamosu. All of his team members are at Level 75, with exception of Urugamosu who is at Level 77.
[NEW] The Rotom formes lose their Ghost-type when they are traded to Black and White. They become the type of the attack they specialize in: Electric/Grass, Electric/Fire, Electric/Water, Electric/Ice, and Electric/Flying.
[NEW] Many of the alternate abilities which Pokémon can have in the Dream World have been revealed. Have a look at Serebii's page for a detailed list. It is still incomplete, though.