So far after an announcement of a Pokemon game info about it it either done by Coro Coro or the Pokemon Smash show and Nintendo Direct. Is there any other media that Gamefreak or Nintendo uses to put more info about the game out there?
Not really. I guess there are game shows like e3 and whatnot, but that's about it.
I don't think a main series Pokemon game has ever been featured at E3 before. This could be the year to break the trend, seeing as how we're getting Pokemon X and Y earlier than we usually do relative to the Japanese release, but...
NOTE: Pokemon Black 2 and White 2 were featured at PAX Prime last year (I'd know, I was actually at PAX Prime), but that's not E3.
Creator of Jay's Journey (see quote!) "It's not ten years old! Therefore, it sucks!" - Nostalgia whores everywhere