If you own either DoW II or Chaos Rising you can now play the Retribution Demo. It is just multiplayer, with no campaign or Last Stand (which is to be expected), but holy #$%*(#$!@!!!!!!
I just played one game against the Easy Computer to see how the Imperial Guard fared in DoW II, and I like them a whole heck of a lot more in DoW II than I did in DoW. I'll have more thoughts later, but I need to go play some more.