Being that they're releasing 4 Turns of Coil and a new Primal fight for 2.2, I think that's going to be their standard for patches. Also I don't know how often WoW releases their patches now, but SE is on a 3-4 month spread where they're averaging 5 new encounter types per patch. 2.3 will probably bring 4 more CT fights and another instanced boss fight.

I actually prefer the way it's setup now that you can complete one raid in one sitting. In WoW there were raids where it'd commonly take 2, sometimes 3 days in multiple sittings to complete something because it was SO LONG. The way content is segmented now (raids/primals/misc. trials like Ultima/GKMM) works well for me.