The real question is whether Canon will announce a successor to the EOS 10D

I'm 100% sure that Canon will either replace the 10D this year, or maybe release a camera between the 10D and 1D. I replacement is more likely though, given how little the gap in functionality is between the 10D and the Digital Rebel/300D.

However, reading between the lines on the dpreview forums my guess is that it won't happen until the end of the year. I think they've just got too much being announced at the moment, with the 1D MkII, a couple of new lenses and heaps of digital compacts. They aren't likely to want to release a new 10D at the same time.