The Pentium 4 Extreme Edition will be squarely targeted at enthusiasts and gamers, and is no doubt an attempt to spoil AMD's Athlon 64 launch. It sounds like the chip may also be sporting tweaked Hyper-Threading logic. Interestingly enough, Doom 3 and Half-Life 2 will apparently both take advantage of Hyper-Threading's second virtual processor.
As tantalizing as the Pentium 4 Extreme Edition looks, the processor surely won't be cheap:
Alfs said the P4 HT EE would not be a mainstream part. Since it would be Intel’s highest performing Pentium4 offering it would attract gamers and users demanding top performance. He said it would be "a little more expensive" than the regular P4 and would be available from OEMs in November.If Intel really wants to cater to the enthusiast community, they'll release the Pentium 4 Extreme Edition with an unlocked multiplier, or at least one that can be lowered. For that, I'd even forgive the chip's painfully horrible name.