They have also revealed another "Mega Evolution" and that is one from the first generation though it is not the one I wish it would have been....and that is.........Kangaskhan though it doesn't take a "drastic" change that the others take so far.....
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The main thing I am curious about is the Mega Stone though, since it is not "available" to be obtained in regular gameplay. Will it be a "reuseable" item as there are multiple Pokemon that have a Mega Evolution and its only coming with Torchic atm.
Also another thing that needs to be noted is that there can only be One Mega Pokemon in battle at a time. Now mind you this hasn't been clearefied to whether or not its for one team or both or if its for all battles. Also the Mega Evolution's take place during the middle of combat.