I think 5D Mark III for sure will have good AF. The good AF can't be only on the 1D series anymore.
Reason is very simple.
Canon has to answer to the upgrade of D700 (with D3s sensor). Canon uses to have a advantage on the L primes (35mm 1.4 in particular), but Nikon has released a few very juice primes. Canon no longer has an edge over Nikon on lens or body.