Would that justify twice the price to you?
In the pre-order add it says that the 5D3 would already have increased weather-sealing and I think the 5D2 already does a good enough job for anyone but the real heavy duty photographers. The same counts for the frame-rate. It's nice to get 10FPS, but how often would you really need it? And for the times you do timing your shots can be just as important as the frame rate.