i'm waiting for the 5D MKIII, but not so I can buy it, i'm waiting so i can buy the MKII which will no doubt be quite cheap!
Though who knows it might have things to tempt me. Am not aware of any issues with the MKII myself.
Regarding the 40D, i'm selling mine on ebay at the moment, and it currently has 55 "watchers", so there's obviously a hell of a lot of people wanting them still. They go for around $650 FYI