Can't Pre-order Watch dogs?

[Tandy]

watch on highest quality possible

Okay, this is now very, very strange. It may be blocked in your country although i doubt the USA would block it....
A universal fix for most things is to go to your steam folder, and delete everything apart from your 'steamapps' folder and the 'steam.exe' After deleting those restart your computer, let steam re-install itself and try it again, let me know how that works out for you. I hope this will fix it!