Wolfdale will arrive later this year, it's a 45nm processor with more cache memory, the new SSE4 instruction set and several optimizations to deliver more performance.
The sample HKEPC tested was clocked at 2.33GHz and they found that not only it was 10% faster than a 2.33GHz Conroe processor, it also used less power and thus ran less hot.
The Intel Core 2 Duo E6650 used 61W idle, the 2.33GHz Wolfdale only 43W. During load the E6650 used 83W and the Wolfdale sample only 59W.
Looks pretty sweet .