Hmm, but which of those games is *new*? play one, play them all.
Well haven't played any, so can't say for sure ;)
From what I've seen/read of it, Gears of War is quite different to anything else. Nothing is entirely new, but I can't think of anything else very similar.
COD3? Probably not. Probably just like COD2.
All the reviews seem to suggest that Rainbow Six Vegas is quite different from previous RSix games, but again, that's not first hand knowledge.
From what I've seen of the Wii ( instore only up till now ) I'd say that the word which comes to mind is novelty, rather than new. You can see the novelty wearing off when people are just trying the stuff in the shop for half an hour, so that doesn't bode well. But then I wouldn't really associate Nintendo with new. They have titles like Zelda, Mario, Metroid, and people have expectations from them so they really can't do anything too radical.
I doubt the PS3 will be much different. Metal Gear Solid 4, Resident Evil 5, they're going to be visually stunning variations on an old theme, aren't they? A few new ideas, but nothing too risky.
Ultimately, who can afford to do anything new? These console developers have invested millions in each game, and if goes tits up because they tried to innovate and people weren't too happy, they'll be in right lumber.
Personally I like a few new ideas and much the same as before with better graphics. I've played and loved every Splinter Cell game, and that rarely changes much. ( 4 changes more than any previous game, but it's still quite familiar. ) When Resident Evil 5 comes out, I hope it's amazing and it probably will be, but I don't want it to be TOO different from RE4 because RE4 was near perfect.
Honestly, if you want new, I think you already said it. Why do you want anything other than a PC? It's a completely open platform so people can do all kinds of weird stuff and many of them won't care if it goes tits up because they haven't invested $46,000,000 in it.