Heavensward will probably involve us resolving the Ishgardian war to get Coerthas into the alliance, or come after they enter the alliance (We help them with their burdens, they help us with ours type deal). Regardless I don't see anything happening in terms of Ala Mhigo anytime soon, adding a region like that in an expansion that has basically been advertised as nothing but Coerthas, Coerthas, and Dragons would be a bit of a surprise. In terms of the Garleans, it's too early to say in my opinion. I do agree that if we see any actual action from them it would likely not be until the end or at least mid-way through the 3.X series. Though their number 1 concern has always been controlling the primals, if more summonings ala Shiva's take place they may be more inclined to speed up their efforts as was hinted in this patch's story.