June will apparently see another showdown of new graphics cards from NVIDIA and ATI.

AMD's ATI will push out the ATI Radeon 4800 series apparently featuring some hardware physics engine.
The ATI Radeon will come as 4850, 4870, and 4870 X2. The 4870 slated for end of June actually sports DDR5 memory. The 4870 is supposed to have the same performance as a dual-GPU 3870 X2.
TG Daily obtained lots of leaked ATI 4800 details.
NVIDIA is rumored to launch the GeForce GTX 200 cards in the same June time frame.
The NVIDIA GTX 200 cards are featuring a 2nd generation Unified Shader architecture. The first cards include the GeForce GTX 260 and GTX 280.
See also Digitimes.