In case you haven't heard yet, Canon has (finally!) announced the 5D MkII. It has a 21.1 Megapixel Full-frame CMOS sensor; a new DIGIC 4 processor with 14-bit A/D conversion; ISO range is from 100-6400 (expandable L: 50, H1: 12800 and H2: 25600); and it has full HD movie capture.
What's lagging is the AF system, which seems similar to the old 5D with 9 AF points (plus 6 hidden). It's also supposed to have some 'weatherproof' features, but the microphone for the HD Movie mode on the body may be a weak point. Time will tell...
Price: USD $2699
Availability: November 2008
More information at dpreview.com or at Canon USA.