I believe the images to probably be real (or a really good fan creation)...
... but I don't think Palutena will be playable. If anything, I'd expect this to be a scene from some sort of story mode (remember, he has only said "no Subspace Emissary style story mode"). Even just an "adventure mode" type, with Palutena showing up in a quick cutscene before the Kid Icarus inspired level, is plausible.
Basically, until it's officially announced, I will assume Palutena isn't going to be playable, if only because I don't think she's suited to combat (she has Pit for that sort of thing, after all).







