The PlayStation slim is already out. In fact although the old PS3 slim models are still in production Sony has already started making a new models of the PS3 slim 120 GB and 250 GB models starting in May 2010 see related link.
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PlayStation x PlayStation 1 PlayStation 2 PlayStation 2 slim PlayStation 3 PlayStation 3 slim Coming soon - PlayStation 4
Yeah. Why wouldn't it be?
slim
the playstation 3 250 GB can not play playstation 2 games
with new models like the slim the answer is no but with the older models yes you can for more information look at the playstation 3 article on wikipedia