Demo has just been released and I have to admit after reading the huge preview in last months PC Zone I'm really looking forward to it. Gamershell have 4 mirrors which arnt full for the 290 Mb demo.
Grab it here :
http://www.gamershell.com/news/25383.html
You should be able to get it in all the usual locations like FilePlanet also, lucky if you have their premium access to get it straight away, however I'm downloading from Zen UK via Gamershell and its coming in at around 114 K per sec