October 20th 2009 - Canon announced today the release of the new Canon EOS 1D MkIV DSLR. The major features are:
I'm sure Canon remember the initial (and continuing) problems with the AI servo tracking AF drive on the EOS 1D MkIII under difficult conditions and so they have likely gone to great lengths to make sure the AF system on the 1D MkIV works well! They have introduced a new AI Servo II system which they describe as follows:
Sounds good, but we'll have to wait and see what the performance is in real world testing. Canon have a more detailed description of the new AF system on their website: http://www.usa.canon.com/dlc/controller?act=GetArticleAct&articleID=3107.
The full specifications for the Canon EOS 1D MkIV can be found here on the EOS 1D MkIV specs page.
Here's the Canon USA Press Release on the EOS 1D MkIV: