Since GT5 Prologue already featured a F1 car (the Ferrari F2007), I do believe the final GT5 will have "something" about Formula 1 built into the game, but it is almost certain it won't be any kind of fully fledged F1 mode neither will feature the latest F1 cars, teams or liveries (all due to licensing issues).

If you were to ask for my opinion, I think it will be just a few "classic" F1 cars given out as bonus for accomplishing certain feats in the game.

When will companies realise that not releasing demos will hurt sales and/or increase piracy. I for one am not willing to shell out on a game unless I have played it a little and rentals are too expensive.

I played both Bioshock and Oblivion "borrowed" on the PC first, had I not done I would never have bought Oblivion. Likewise the Blur Open Beta sold that game to me. Demos/trials are vitally important to many people.