One team is able to get the buff called The Crowd Chose You, and it gives +1,000% damage, decreases damage taken by 100%, and allows you to see stealthed units. No details yet on how you get it, but Holinka tweeted that more info to come in the next patch notes. I think this is intended to end 2s matches where a healer's teammate dies, and he/she turtles to and runs out the clock.
Some more info here and a screenshot of the buff - http://www.arenajunkies.com/topic/23...e-buff-on-ptr/