Good reasons, but why do developers insist on using the Xbox360 as a Standard to Demo or Preview new games. The fact of the matter is, every game is first created on a multitude of PC's at a company (engine, game code, 3d modelling, level design, artwork, etc). So what if the console version is inferior, it's always gonna be, untill they start making them upgradable.
It's like, "Hey, I just made a BADASS game using all the latest tech, but im gonna show you how it runs and looks in DOS". thats what im getting at. People chose to be inferior when they chose to make a game console their platform of choice.
360 is the lowest common denominator plus if they showed off PC tech like i said console players may become jelly. Crytek did it with crysis 2, they pretty much hid away pc footage/screens deep within vault, until someone leaked a beta with basic dx9 and you had to mod in some effects even THAT looked far better than the 360 demo but yet why did they not show it off?
The only thing that concerns me with the graphics on the pc is not low textures or water we can mod those, it's DX11 support. From what we have heard/seen i really doubt the need for anyone to upgrade there rig for this game. There are other games coming out that one will have to upgrade for, crysis 2, bf3, shogun 2, witcher 2 ect.