It was one of the goal of this PvP session :
viewtopic.php?f=6&t=386
The goal of this session is to check PvP mechanisms plus the Vanilla battlegrounds: Warsong, Arathi & Alterac. A section in the forum will be available to you to post reports regarding any issues you encounter. Adding issues in this section is critical for us as it is the main purpose of this session: please use it.
Thanks to the 407 players who participated to this session, we now have the remaining list of issues to fix.
By the way, 50 problems were analysed/solved in less than 24 hours thanks to our development team.
PS : PvP issues are one of the most difficult things to fix.