If you are in the Canadian region at the moment you will have access to the 1 vs. 100 BETA which is currently ongoing. That BETA is due to be expanding according to the 1 vs. 100 Twitter page. Unfortunately it is just expanding to US LIVE users, which means no 1 vs. 100 for us UK or European users *Sad Face*.
The official 1 vs. 100 Twit reads:
US Beta start date will be revealed within the next 24 hours. Stay tuned!
Hopefully this means that they will eventually do a BETA for us European gamers. Fingers crossed anyway! Stay tuned to Console Monster to find out more info as and when it becomes available!