June 23, 2011, will mark the 20th anniversary of the release of the first ‘Sonic the Hedgehog’ for the Genesis, and Sega will mark the occasion with a new title for the Xbox 360 and PlayStation 3.

Sega’s teaser trailer begins with a rendered Sonic being shown running around a 3D recreation of one of his typical landscapes — almost ‘Sonic Adventures’-ish — before he is joined by a version of his less-detailed older self, complete with the origianl black eyes.

What does the presence of a second Sonic mean? Multiplayer? Alternate universes a la ‘Spider-man: Shattered Dimensions’? Sega hasn’t said anything, not even the actual name of the game.

Certain people you just can’t please. And by “certain people,” we mean Sonic fans. In the hedgehog’s two decades on this earth he’s garnered an incredibly broad fan base from 16-bit platforms, 3D games, comics and TV shows. Meaning poor Sonic has to cater to several different sects of conflicting expectations, that’ll ultimately leave someone unreasonably dissatisfied. But that’s not gonna stop Sega from trying!