Quote Originally Posted by MiRai View Post
A Blue hints that there are some cool rewards you can receive once you achieve certain ratings:
I definitely recommend that you keep your eyes on the patch notes blog, because there are several cool rewards that we are planning to introduce in patch 5.3 that you can get at certain ratings.


http://eu.battle.net/wow/en/forum/to...1160?page=2#29
probably a tabard...or new mount