$5 this gets merged.
Anyway; There was never any chance of it being an evolution - Mewtwo is a legendary pokemon and one criteria for being a legendary is that the pokemon doesn't evolve.
I am disappointed that it is a new forme not a new pokemon, Mewtwo is a pokemon that you just shouldn't touch especially as it was already great and had a far better design originally anyway. I don't hate the new forme but really it just doesn't compare to the original design of Mewtwo and I'm very disappointed with Gamefreak.
Also - please, please, please give him the same voice as his other two movies for the English dub of the Mewtwo vs Genesect movie, PLEEAAASSEEE.