If V Jump and Dengeki Online hadn't tweeted images of the booth setup at Jump Festa, one might think the concept a silly prank, but it looks like the next big Pokémon announcement is a crossover with Nobunaga's Ambition (Nobunaga no Yabou).
Pokémon + Nobunaga no Yabou—a collaboration between Pokémon Company and Koei Tecmo—is set for release on Nintendo DS in spring 2012. The title and date are pretty much all we really have to go on right now, but Pokémon is totally going period piece. Dig the images below, including photos of the game's Jump Festa booth via V Jump and Dengeki Online's Twitter.
Updated: Some more info added.