Well we new this day was going to come and it has, Hot Hardware have posted up a review of Intels new 2GHz Pentium 4 Socket 478 Processor. Heres a snippit:
The only real difference for this iteration of the Pentium 4, other than clock speed, is the package. Intel's Micro PGA (mPGA) device, has 478 pins versus their legacy 423 pin package. This provides more power and ground pins, which will help provide a more robust power plane to the device and minimize noise with better grounding. As such, stable 2+GHz. speeds will be obtained.