Sega will be milking the announcement of Sonic the Hedgehog 4 for all its worth, doling out additional announcements and countdown clocks to drum up hedgehog hype. Perhaps the most interesting tease is the game's fourth platform.
Sonic 4 (nee "Project Needlemouse") has been officially announced as a PlayStation Network, WiiWare and Xbox Live Arcade download, but a handful of observant readers have pointed out that an additional platform appears imminent. A hidden logo, one that appeared in the announcement trailer and now on the official Sonic the Hedgehog 4 web site, makes it mysterious.
Sega's not revealing what that platform is for the time being, leading us to conclude only one thing: Dreamcast 2. Most likely releasing on 10/10/10.
Update: Yes, it appears to be the iPhone. Smart Kotaku commenters have already figured it out. Looks like the Dreamcast 2 launch will have to wait until 11/11/11. :(