Got mine yesterday. Brian's correct, the demos are Gunmetal, Timesplitters 2, and NCAA 03. No GT2000, unfortunately.
I played a bit of each last night...TS2 is almost eeriely like Goldeneye, which is definitely not a bad thing. NCAA seems like a quality football title, but I got to play only through the first quarter. Gunmetal looks and plays pretty cool (switching from a jet to a mech and back is neat) but it isn't my kind of game.
Last month's demo disc was the best yet in my opinion (Outlaw Golf, Hunter, Crazy Taxi 3, and Street Hoops). This one falls slightly short of that, but the three demos are all pretty impressive. I haven't even opened the mag yet.