You can still pre-order Murderhoof and play him when he goes live after this week's game update (5/15)! Login to the game store and select the Founder's Edition bundle.
Murderhoof is a ruthless centaur warrior with a thirst for blood. Becoming stronger with every kill he participates in, Murderhoof bullies his lane opponents and devastates enemy groups in teamfights. Murderhoof gains Rage by using weapon attacks or through kills and assists, consuming these points to empower his abilities with bonus effects.