Although not confirmed yet, Intel is said to be abandoning Pentium 4 architecture and their plans to base future processors on the P4 core in favor of the Pentium M (used in Centrino and other notebook models).
Chip giant's new plan would be to shrink Pentium M core as soon as possible and work on 64-bit capable as well as multicore processors in a not so distant future. If this is true, Prescott's succesor called Tejas (code-name) would never see the light of the day.