I tried the demo. The game is better than DeusEx:IW however there some things that they could have done better.
The game must be run in administrator mode.
Levels are quite small than what is possible to fit in current PCs. I guess the 64Mb limit of the Xbox plays a role here.
The graphics is OK, nothing ground breaking but do its job.
Movement is kind of jerky.
The demo couldn't make me interested. I'm not going to get this game and the Thief series wasn't that interesting for me anyway.
Intel 80386 16 MHz, VGA graphics, 4MB RAM, 30MB HDD, 3.5" floppy drive
45303 3dMark06, Crysis 2 60 fps all settings at highest.