The card you are seeing is the R520 XT. It is a dual slot solution and uses a cooler similar to the X850. ATI will also offer one-slot versions which will have less performance.
The will only be PCI-Express boards. AGP versions are definitely not planned.
Internally the chip will use 512-bit memory transfers. However, the external memory interface will still be 256-bit – expect some nice marketing from ATI regarding that “feature”.
If these pics are 100% legit, we can expect to see a release date not too far off. I personally can’t wait to see if the rumored 32-Pipe wonder is actually going to be a reality or not. Check out techPowerUp! for the pics and posting!