oh I have. not all the DLC though, which will be the reason I would get this. not sure about the graphics "update", seems flatter with more lens flare to me. Lets see, not preordering this for sure.
Ya if you've played this already probably not worth the pre-order, but I've heard they added a lot of the enhancements in the later games to the first game. So I'm definitely considering a second playthrough.