Hum... from what I remember, Cathar designed WW with the assumption that the heat would spread no more than 2mm outside the dimensions of the core, at least not with any significance, for the purpose (from his simulation?). Knowing that the baseplate is pure copper, less than 1 mm thick, that should give you an idea of what to expect from the IHS.
What seems to be ignored is that, although there will be a performance degradation from the additional TIM joint, there will also be an increased thermal gradient right through that IHS.
In other words, just pop the darn thing off, and be done with it! We already know that the P4's IHS will add a couple of degrees.
But to answer the original question: All commercially available blocks will still function properly, for the larger die of the new AMD processor. Most blocks have a baseplate that's just too thick, so it's not going to make a difference. In the case of a Maze2 for example, the heat might start spreading into the channel wall, which would actually help performance, but because of the massive bp, it won't be measurable.
WW might suffer a bit, but I think it'll still do well. Cascade might also suffer a bit, but given that it's already the best design, a small decrease in performance will still make it perform extraordinarily well. These two blocks are minimally designed for the size of the core.
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