Three weeks ago, I wrote briefly about the rewards from having reputation with Pandaria's factions. Three weeks ago, all I had was beta to go on, and on beta all the factions had dailies open to me independently of each other.
When Mists of Pandaria went live, we found out that it really should have been named the Golden Gate Lotus faction, complete with "You Shall Not Pass into August Celestial reputation" signs. Then we had a hotfix of the Justice Points and Honor Points gear to bring them in line with each other ilvl-wise, a hotfix that removed reputation requirements for justice point gear, and some more hotfixes opened up some of the valor gear behind faction reputation lines.
While your heading was spinning with all the faction-made gear changes going on, I was writing it all down to figure out which pieces I should be questing for.