In the latest trailer, four new Pokémon have been officially revealed with English names:

Crabrawler - a Fighting-type crab with Hyper Cutter or Iron Fist
Sandygast - a Ghost/Ground-type sandcastle with Water Compaction (evolves into Palossand)
Palossand - a Ghost/Ground-type sandcastle with Water Compaction (evolves from Sandygast)
Stufful - a Normal/Fighting-type bear cub with Fluffy or Klutz (evolves into Bewear)

Water Compaction is a new ability to appears to boost the Defense stat when attacked with a Water-type move.