At best Nehalem will be out sometime in H2 2008. I'm guessing the Extreme version by late Q3 2008, and more affordable Nehalems in Q4 2008/ Q1 2009. Gotta remember that they will be switching sockets too.
Incidentally, does anyone else out there think that the French reviewer did a great job? Give Florentine (I think that was his name) some page space on the US side, I say!