Well said TV.
As far as the original post goes, the kentsfield needs 220 watts so I don't think we'll ever see it in a laptop.
Add in the GPU, hard drives, optical drives, USB devices, sound, TV tuner, etc., and I would imagine a kentsfield laptop would need somewhere around 350-400 watts. That would be a rather large power brick.
I'm not sure there's a laptop battery that could supply that much power, even if everything was power-stepped.