Sega's new site, not the Sonic game?

Sega promised the world a new all-formats Sonic game in February and has just put up a new teaser site in Japan. The trouble is, it doesnt look very Sonic like. With the reveal set for next Tuesday, this looks very elven and adventure-themed, any ideas?

While there's no guarantee it'll be a Vita game, Sony folks are making lots of positive noises about lots of new games, so there's reasonable chance that this could be one of them. And, no there's no leaving the name in the source code, like some monkeys still do.