According to a trademark filing found by Kotaku, Sega has "shotgunned" Sonic Unleashed. The filing applies to "video game software [and] computer game programs." Clearly based on that thorough description the newest Sonic game will be a dating simulator.
In all seriousness, this one can't possibly be worse than Sonic's last outing on the Xbox 360 and PS3 - we hope. Also, note that this doesn't seem to have anything to do with the Sonic RPG Bioware is working on. We can't wait to see what Sonic does next. We are so totally serious and not being facetious at all, not really. Oh, and when was Sonic ever leashed.