Why it could be a fake? Lack of website attached to it, no mention of it on Sega Japan's website,No big promotion or countdown before the big reveal(IE they wouldn't give you the name of what it is until the reveal) and that Sega doesn't usually reveal japanese centric material at E3.
Why it could be true: Sega themselves hasn't debunked it and they must be getting emails from everywhere about this, its a photo from something they weren't going to reveal yet until june which explains lack of webssite material, Not the first time Sega japan revealed stuff for E3(sega revealed several arcade games and Sonic 2006) at an previous E3,
So take your pick what's more plausable...
