Eldacar over at Battlemasters.org writes:
If you are an avid PVP’er and want to help improve the PVP side of the game for Mists of Pandaria now is the time to make your voice heard. Hit up this feedback thread on the official forums and put in some good constructive feedback about what you did and didn’t like about Cataclysm’s PVP. The better our feedback the better our chances of creating some positive change in the coming expansion.
Please consider Kaivax’s advice when posting feedback on this forum: specific single points are nice, but breadth of content is nice, too.
Thanks to Eldacar for starting this thread going on the forums!