I cant seem to better the 40D at the moment with any new Canon for just photograph taking.
I think I will update my lenses with stabilizing save lugging the tripod around.
One will be the Sigma 17-50mm f2.8 OS, and at a later date the Sigma macro f2.8 105mm OS.
looking at the 60D 70D. The 7D, I will wait and see what follows.
Plus points weather sealed camera.
More focus points.
Better maximum light sensitivity. Slightly more mega pixel. View finder better coverage.
Better ISO Doubled.
Neither have the magnesium body and that's a bit of downer just plastic on a frame.
No doubt GPS will follow and wyfi not that it will improve picture quality.
The rest of the improvements seem to go to the live view flip out touch screen etc. and video. All looks impressive but wasted on me.