It was inevitable we suppose, but somebody's finally spilled on the shenanigans behind that "Windows 7 Ultimate" leak from a couple weeks back. According to JayDog over at TG Daily, who apparently received a version of the infant OS, the Windows 7 "Milestone 1" build is all Vista on top, but with the beginnings of a theoretically lean and mean Windows 7 kernel underneath, manifested in some slight speed improvements. It's not much, but it's a start, now let's just hope the optimists are right about that 2009 release date.