actuly what i saw it isnt goignto be Adventure time its goign to be Skylanders/ my little pony. THIS one is confirmed if you go to happymeal.com and go to toy then click next toy. Currently its Mr peabody and after that there doing the my little pony. i jsut went there and saw it.
Oh you're right! Here's a screenshot from their site -
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loginAnd look! Luna!
[image size edit ~ many thanks ~ hathorcat]