Seems a bit silly to me really.... Who cares what its called, its gonna be a bag of bull droppings when its released, everyone is going to hate it (well apart from those people who use it). Its going to generate no end of furrious typing by those who have never used it and never will (they will probably be using a Vista system which they will think is the bee's knees despite them hating vista in 2007/8 when they said MS would have to pry XP from their cold, dead hands.
Windows 7 seems in keeping with intels new i7 CPU due out soon, but by the time W7 hits the shelves that will be an obselete CPU... I imagine that 12 months before they launch W7 some bright advertising spark at MS will suggest they call it something like Windows Glide and they will go with that....