Finally. The 5D Mark III is ready for its unveiling tomorrow. In the meantime, Canon Rumors has got the deets.

For starters, how about:

22.3 Megapixel Full Frame CMOS sensor
DiG!C 5+ Image Processor
ISO 100-25600 (expandable to L:50 H1:51200, H2: 102400
Full HD Movie (ISO 100-12800 (H:25600)