The Canon Powershot Pro1 is an intriguing camera! It's larger than my Canon Powershot G3, but has a 28-200mm equiv. zoom lens (versus my current 35-140mm equiv. lens). The extra wide angle would be particularly useful to have. Realistically, I'm tempted to keep my G3 and possibly get myself a full-blown SLR, which I could use when I want to have every possible option. The G3 could still go with me when I travel due to its relatively light weight and size, while the SLR would be the no-compromises über camera.
The real question is whether Canon will announce a successor to the EOS 10D. DPReview said, about the 10D: A year on and just as they did with the EOS-D60 Canon announced its successor, the EOS-10D two days before the start of the PMA show. In total it's three years since the original EOS-D30 was announced (although only two since it hit the streets). Just a few weeks more and we'll know.