>>37288406>Gen 8 introduced a free camera and expanded upon mega evolution.Not what I think will happen, but my dream would be any in-battle form change (Mega Evo, Battle Bond, Primal Reversion, Ultra Burst) to go under the Mega Evolution name. A 'Mega Evolution' can only be done once per battle.
What is currently called Mega Evolution will be called XY Evolution, or XYZ Evolution for the inevitable Mega Mewtwo Z in the upcoming film.