We know what you're thinking, but no there doesn't seem to be a Pentium 4 666 as part of Intel's future numbering plans.
Instead, it is releasing chips with 2MB of cache, numbered the 640, the 650, the 660 and the 670.
These chips appear to have Intel's version of "cool and quiet" and no doubt will have the NX flag implemented too.
More here. µ
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