I think GT5 Prologue is exactly that; a prologue to the full game. So, yes, it is more-or-less half the game. I'm not too sure myself when the full game comes out though.
There is also the GT5 Concept HD that is free on the PSN Store.
I imagine people are saying it should be free because people generally don't want to pay for a "demo" of a game, which some people would consider this because it is only a portion of the game.
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