A Final Mystery To Sonic 4?

I was on the Sonic 4 website when I noticed something strange in the trailer video. In it, I saw that there was a locked platform Sonic 4 would be on. The word "locked" in this case means that SEGA has not revealed infromation or media on the subject, but will reveal it in time. These "locks" are all around the Sonic 4 website (if you haven't already seen it (www.sonicthehedgehog4.com)) equiped with a timer that counts down the remaining hours or days until the media will be revealed. After looking around a bit, I noticed a huge advertizment on the platforms was up, with a lock in the background. There is 1 unknown platform Sonic 4 will be on, and I ask: What could it possibly be? Other than being on the PC, what could SEGA have instore for the final platform? Will it be something no one really cares about? Or something huge like an unthinkable new SEGA console?? We'll have to wait and see.