Happens with every new revision of the PS3.
PS3 slim'll probably have no blu ray drive like the PS3 GO has no UMD drive forcing you to buy PS3 titles through a new online service, devised to combat the impact of most game places making most of their money from pre-owned games.
I don't really think this'll happen, but I wouldn't be surprised.
Expect one more less USB port or the loss of PSX compatibility or something similar.
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