IIRC some of Intel 'soon' products were supposed to use about 150 Watts... So they don't only need totally new cooling, but new power supply and motherboard desing.
I recall, “BTX” specs was required for some high speed Prescotts… Lower speed Prescotts (i.e. speed similar to current Northwood) would still use current Pentium IV infrastructure.
Also, SocketT has similar pin count as the AMD’s Athlon 64 processors.