In yesterday's PTR patch, there was an unannounced upgrade to weapons from Tempest Keep and Serpentshrine Cavern - no doubt in response to the discontent among raiders over the quality of the weapons compared to Arena Season 2 weapons.
Fear not, though - Blizzard has come through for you! Sub-boss weapons are now 2 item levels lower than Season 2 weapons, and arguably better for PvE than said PvP weapons, while Kael'thas and Lady Vashj weapons have been upgraded to be as good as weapons from the sub-bosses in Black Temple and Hyjal.
Images of the upgraded items are below; 1h weapons saw an increase of 3-4 DPS, while 2h weapons saw an increase of 3-5 DPS, along with statistic increases.Serpentshrine Cavern Item Buffs
And of course, you can check out all the compiled 2.2 changes here.