It's going to take Sony awhile to be able to get the temp down low enough to offer slim PS3s. IBM's Power6 architecture is white-hot and the process will have to get down to 32nm before they can even consider slimming down that heat-box.
So, consider it EXTREMELY unlikely that we'll see a PS3 Slim within the next 20 months. 32nm is still a ways away (at least for IBM architecture).
Of course, the same principle applies to the 360. It is also based on Power6.

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