From Slashgear via China
1Ds Mark IV Specs
- CMOS Size: 36Ãƒâ€”24mm, 21MP.
- ISO25-12800 (Ext ISO10, 25600, 51200 )
- 69 focusing points (TTL-AREA-SIR II AF)
- Flash Sync Mode of 1/4000 ESR
- External HD and USB2.0
- 4:3 and 16:9 display
- HDMI, LiveView
- 6.8 fps
- 2 DIGIC4 processors
- 24fps or 30fps HD Movie
There is also a info in regards to new lenses
“2 upgrade lens come out with 1Ds Mark IV, 100-400L F4.0-5.6 IS and 50/F1.4 USM”
The 100-400 will be a hot rumor until it's actually replaced. Don't expect a 50 f/1.4 USM upgrade before a revamp of the 35L & 135L.
EF 400 f/4L IS [CR2]
A different source claims Canon has demo versions of a non DO 400 f/4L IS lens in the hands of testers. This is something I heard a few months ago, and it has resurfaced.