There's a preview on DPReview. Looks similar to the rumours apart from the AF-On button, which I've not seen mentioned anywhere.
I like it.
883 UKP (at the Euro rate) is bloody good too.
Funny it came out on Amazon first. DPreview's owners stole the glory there!
I reckon if the 40d handles noise at high ISO's anything like the mkIII there will be a lot of 350/400/20/30d's for sale. It could add a couple of hours photography to a UK winters day!