Interesting bit just tossed our way by the Canon rep when we asked about a 5D follow-up, slightly paraphrased: The EOS-1Ds line (their full-frame pro DSLRs) is on a three-year upgrade cycle. The 1Ds Mark II came out in 2004, and the Mark III dropped in 2007. The EOS 5D came out in 2005.
Draw your own conclusions.
