Microsoft's published its demo schedule for PAX 08, and there should be plenty there to keep you happy. Assuming you're going to Seattle next week, obviously. And you're into Marcus Fenix.
Gears 2 and a showing of Xbox Experience are both on show, neither of which made Leipzig last week, but there's no sign of Halo Wars, Banjo, Viva 2 or Fable II.
Full thing through the link.