Big news today from Blizzard:
We’ve recently implemented an often requested feature to enable cross-realm raiding for Siege of Orgrimmar. Cross-realm BattleTag™ and Real ID friends can now raid together and take the fight to Garrosh on Normal or Heroic difficulty. Players will be able to earn greater rewards such as Reins of the Kor'kron War Wolf or the title of Conqueror/Liberator of Orgrimmar; both of which aren’t available to be earned within Flexible or Raid Finder difficulty.
This change is currently live. (Source)
This unannounced change is surely going to please quite a few PvEers out there, and hopefully line our pockets with a few more gold coins. This announcement was pretty unexpected, no prior notice until today, the day it went live, but I'd definitely expect an increase in gem/enchant sales once players start to notice that it's live. It's not clear to me why Blizzard chose this week to implement this feature, but none the less it is here, and hopefully you'll be able to take advantage of this big change!