I woundn't be the least bit surprised if the XBOX2/PS3 could do realtime graphics like those screenshots. Like has been pointed out already, but I'll repeat for good measure:
1. PC Games dont look that good becuase they need to keep themselves within available hardware limits. In other words, the lowest COMMON denominator is the system they shoot for. If your game ONLY runs on a P4 3.8GHZ 2MB/L2 Cache 800FSB 4GB DDR2 400MHZ nVidia 6800GT 256MB (you get teh point).. your only going to sell 10000~ copies as not everyone has that setup.. yeah, the game may look fucking awesome, but not many people could appreciate it.
2. Console games are able to take FULL advantage of EVERY system resource, little or nothing else is running while the game runs. They can be optimized to take advantage of the dedicated hardware, every system is the same. The only time that graphics start to fall is when the game is made "cross platform".. we all know that games that appear on all three systems dont look anywhere near as good as games that are console exclusive.
____________________________________________________________________
BTW, For those looking to a KICK ASS HDTV/Moniter combo, check this baby out:
Westinghouse HDTV Ready LCD TV w/DVIGet yourself a good video card and a good TV Tuner card (one that is HDTV