http://www.chemicalhardware.com/jcms/
You can check out the link to a whole bunch of links to various reviews.
I am hard at work on an article giving a large break down of all the changes. I only got the full details on the 6th and have been going hard since then but this card is a MAJOR change from all other cards and I have had to do a lot of research myself and been in talks with the wonderful people from Beyond3D on what everything comes down to.
The one article at this point I do wish ti directly point out is the Beyond3D
article. As always, this is about the most in depth look of the GPU architecture you'll find in english, 3DCenter might beat them in overall but its a German site, both though are without a doubt two of the best websites out there.