I for one am looking forward to the 5D3. That will be my gravy. 24 mpx, 7D AF qualities, swivel screen (I bet), weather sealed, improved DR, better high iso.
I got approval from the boss (wife) a few months ago to buy a 5D2, but I'm holding out for the 5D3. I really hope it shows up early 2011.
I would prefer no swivel screen, but it will probably have one. There is a non-trivial chunk of target market share that shoots video at a more serious than casual, but less serious than pro, level. These are people that would have a good case for a swivel screen, but maybe can't justify an off camera monitor yet.
I've only bought a camera with a swivel screen once ( PowerShot G3 ), and besides flipping it over for storage, I think I only used it once or twice. There is the argument for macro/above the crowd/ground level shots. But except for high shots, where it obviously doesn't work, I'd prefer to use an angle finder c. But hey, that's just my opinion, and I'm not even in the expected target audience for this class of camera; so I wouldn't expect anyone to care what I think.