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I've just installed the Tomb Raider Legends demo and I can run at full resoloution, with antialising, with all the settings turned on, and I still get more than 60fps.
The only thing is, even on my 6800GS, the Advanced Graphics (or something like that) is blanked out, and can't switch it to ON.
Though it does say the recommended video card is 512MB of RAM and a Geforce 7800 or higher. Maybe thats what that option does. Adds better textures.
I have to say though, the game isn't as impressive as I thought it would be. The graphical effects don't blow me away or ANYTHING.
It is a bit easier to control though, but the camera is still pretty rubbish, and I don't like the gun system at all with it locking on in a poor fashion, etc.
It actually still feels like Tomb Raider 2, but with SLIGHTLY better graphics. You don't notice any of the advanced ones while playing, which is why its pretty poor. There are some okay touches, but not amazing or anything.
The characters on screen except for cutscenes don't speak with mouths opening or closing either, and all the rest of the characters except Lara look low poly, etc.
Though thats the end of that preview
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I think that game engine above surpasses the Unreal 3 engine. I wonder what your views are on that?