I dont care about high MP, but I do hope the 5D3 can match the D800 in other areas such as pro AF and good weather sealing. I would also love to be able to buy special edition without AA-filter, since I don't give a crap about moire patterns in video mode.
But I guess we can only dream of these features.. Canon has always seen 5D-users as non-professionals, and clearly we do not deserve things like pro AF, nor a tightly sealed camera.

If we want such things, then we must dish out $7k for an ultra heavy elephant sized 1D X.