Hey this demo has been out for a month maybe on PC Gamer, but now its publicly available.
You can get it from any of the following mirrors:
3d Downloads
3d Gamers
GameTab
File Front
CoDFiles
Around 130 mb if I remember correctly.
If you've played the first demo, you know it was nighttime. This demo takes place the morning after the first demo.
My thoughts: a bit too scripted for my liking, and this one had too much dependency on my actions.
But otherwise, visuals top notch, level design is amazing.
Enjoy.