I’ve not been following this too closely, as I’m perfectly happy with my Canon EOS 10D (and won’t be upgrading), but the rumour about an 8 megapixel Canon EOS 20D, complete with an EF-S lens and 1.6x sensor , seems to be the most prevalent one at the moment. At least according to Bob Atkins and his Canon EOS Rumours page.

Website: Bob Atkins - Canon EOS Rumours