But it looks like US only 
http://www.rage3d.com/board/showthread.php?t=33920103

Valve Software will be offering over 40 Ubisoft PC titles on its Steam digital distribution platform in Canada and the US, with Assassin's Creed headlining the lineup.
Valve said that Ubisoft's first-person shooter Far Cry and the original Tom Clancy's Splinter Cell are immediately available at a 10 percent discount until April 8.
Steam is also accepting pre-orders for the PC version of Assassin's Creed, which launches April 9.
Valve will add additional Ubisoft titles over the coming weeks, including more Tom Clancy-branded games, Heroes of Might & Magic titles, the IL-2 Sturmovik collection and others.

http://www.rage3d.com/board/showthread.php?t=33920103