I found this on the WorldofRaids website and they got it from WowInsider and I didnt know how many people here look at those websites so I decided it share it here. I used the search button and didnt find anything so.
Q: What ranks can we earn?
A: There will be 4 titles total for players to earn. The ranking needed for each Arena title is as follows: (Rankings are based by Battlegroup):
% - .5%: Gladiator (and Armored Nether Drake sent in mail)
.5% - 3%: Duelist
3% - 10%: Rival
10% - 35%: Challenger