Today’s the day the NDAs on the new NVidia boards are lifted. The 285 is a slightly boosted-clock, 55nm, version of the 280, you get about 10% speed boost and a little lower wattage.
The 295 is much more interesting, it’s like two 260s on one board, similar to the older 9800GX2.
One review, though of course more about game performance, is at HardOCP.
The 295 is much more interesting to CUDA programmers, because we’ll take all the FLOPS we can get!
One nice comment in the above review is that the 295’s SP shader speed could easily be overclocked to full 280 speed.
The first one to build a FASTRA-like box with 3 or 4 of these puppies in it will win the CUDA forum’s official awe and respect. The price for such a box would still be probably only $3500.