Ok, so i found this out today while facerolling on my warrior.
Basicly cleave and heroic strike can be used at the exact same time as bladestorm. This will allow for a much bigger burst and can possibly help you to win over a fair few duels/arena games.
It can be done with this simple macro:
/cast Cleave / Heroic Strike
/cast Bladestorm
Im pretty sure this isnt a repost, i look and nothing was posted about this glitch/exploit.
Enjoy