reported about the Radeon HD 2900 GT's memory interface
and the fact that it has less stream processors
and we've now got the missing piece of the puzzle, the clock speeds.
The stock clock speeds are actually identical to the Radeon HD 2900 Pro, with the core at 600MHz and the memory at 800MHz or 1,600MHz effectivly.
So no real big news there, but the card will at least initially retain the two power connectors that the 2900 series has so far and this might allow for some decent overclocking.
There might be different board designs at a later stage, but we very much doubt it, unless AMD tries to cut cost or starts to sell the chips on their own.