Seems that there are a lot of leaks on Microsoft’s PartnerNet and the newest one is a XBLA port of Crazy Taxi. It looks legit and it isn’t really shocking that SEGA would want to bring the game into HD consoles. They did do a PSP port. Not to mention B.D. Joe appearing in Sonic & SEGA All-Stars Racing.
This is not the first leak on XBLA for SEGA, we all recall the Sonic Adventure leak and Sonic 4 leaks. The source even has pictures of Quake Arena leak, that should be fun.