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Contrary to some views I find it extremely unlikely that the PS3 will be anything less than a new fresh console.
The concept of a PS2 upgrade has been something banded about since release. Quite simply this will not happen. Sony may alter the design (a la PSOne) or make the HDD and modem standard, but there will be no chip or memory upgrade because the PS2 simply does not require it.
Besides, with the PS3 not due for at least another 2 - 3 years, why are you worrying about it?? Enjoy your PS2 now and look forward to the games that are coming out.