Intel has released a new version of the Pentium 4 chip. This new processor line contains twice as much secondary cache as the current P4s, packing a whopping 2MB. The new chips introduced in new 600 series of Pentium 4s have speeds ranging from 3GHz to 3.6GHz. All feature a 800MHz bus.
Intel also introduced a new member of the Pentium 4 Extreme Edition processor family. This chip runs at 3.73GHz and contains a 1.066GHz bus. Intel also confirmed that in Q2 of this year, it would start to sell dual-core CPUs as well. These will, initially, run at slower speeds than existing single-core chips, but should have superior performance.
AMD has released statements that it too will be releasing new products soon. More here.