Rumor: Wal-Mart memo says 40GB PS3 to be replaced in August

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Spankey said:
faster speed (4x or better), smaller diode Blu-ray drive perhaps?

 

Unlikely.  Movies don't really need it, and developers wouldn't be able to utilize the extra speed for games (outside of installs), so it wouldn't have much use and would only add to the cost of the machine.