Finally, some decent news about the 5DMKIII from CR:
This is one prototype, and two others exist.
ISO 100-25600 (L1, H1, H2, H3)
Slightly larger LCD (new ratio)
New autofocus while filming, performance unknown.
All the standard video stuff.
RAW video still unknown
This is apparently coming before any 1Ds replacement.
Currently for sale: N/A