Fortunately my 40D continues to work well for my needs. !0 mp is large enough for magazine ads. And seeing as I don't "motor drive" the camera I've lots of shutter life left.
As I've said all along, cameras are just tools. So I'll look at the new Nikon, Pentax and Sony cameras. The problem with Pentax and Sony is that they don't have tilt & shift lenses, but the Nikon PC-E Micro NIKKOR 85mm f/2.8D is a better lens, in many ways, than Canon TS-E 90 f2.8.
Just have to wait and see how things shake out, but if I do switch I will miss my EF-S 10-22 f3.5-4.5.