The thing is a lot of people are bored, and if the content patches dont come out quick enough they are going to loose subs. And TBCoB is still going to be "the hardest content" when 2.1 hits.

I feel confident that 2.1 will be a huge patch to add lots of things but I do not think it is coming anytime soon. My thoughts are december-Jan. Just look at their track record, sure the quality is good but it takes a while. And it might hurt the game, they are really lucky there are no "big" mmo's out right now. Everyone is either spread out over what they like / use to or waiting on ESO.

The last time SE release something and it was "early" (in my mind) was 1.0 (they announced it at E3 in June then in July they announced a release date of Sept)

Tldr; Dont expect it too soon, get comfortable where the game is at. SE takes their time, but its worth it. But from a buisness standpoint their main advantage is they are the new kid on the block. But that wont last long.