The recent CoroCoro Leak has revealed what appears to be the "full" title for the upcoming 16th Pokemon movie, following the trend of past films in only giving partial title information initially. The title is now known to be Extremespeed Genesect and the Reawakening of Mewtwo. It has already been previously revealed that the film's story will follow from the group of Genesect introduced in the Episode N anime arc, and so it stands to reason that the conflict between Team Rocket and Team Plasma (originally cancelled due to Japanese earthquake) will be brought to the forefront as part of the movie's premise. This movie will be Mewtwo's first anime appearance since the 2000 film "Mewtwo Returns", so how the producers will take advantage of the improved animation capabilities now at their disposal remains to be seen. An image of the revelation may be viewed below:

Oh jeez...ANOTHER movie with Mewtwo?

Seeing two scientifically created Pokémon potentially duke it out?
Hell, that actually sounds pretty cool. Sign me up for a watch.

Man, I can tell this movie is going to be epic, Mewtwo and Genesect.... two plain awesome Pokemon, and I am really glad Mewtwo is back.

I have a feeling Ninfia is gonna randomly appear in the movie such as Blaziken and Munchlax did. (Making an appearance before the release of their generation.)

"Extremespeed Genesect and the Reawakening of Mewtwo"...
...Holy long words, Batman.

http://www.youtube.com/watch?v=l8JCX9E0bEI

Thought the animation studio had given you a break, Mewtwo? Nope.avi you had a nice rest but your rest is no more! Seems they're pushing this big purple monster battle so they can be rivals as they're both genetically enhanced creatures. So this will be fun, can the old keep up with the new? Only time will tell.

Can't be to hard them to screw this up

Not that I was expecting this movie to be bad after last years turned out so good.