As a big fan of Greninja... you have no idea what a shock it is to see these information leaked out recently. According to serebii.net the pics released show a Greninja form that is very similar to how Ash looks like.

Something speaks of a huge prelude to new Mega forms being released and if that Greninja belongs to Ash... he just stepped up into the high level of badassery!

http://www.serebii.net/corocoro10152.jpg

http://www.serebii.net/pokemon/xyzforms.shtml

More information can be seen on Serebii.net