We've gotten like... the same amount of content it seems that HW, SB and ShB received when their expac launched. 6 MSQ dungeons, 2 optional dungeons for expert mode, 3 NM trials, 2 extremes on release day, as well as dozens of side quests. Granted, I did only join a bit over a year ago so I obviously don't know what it was like exactly on patch day and beyond, but. It feels roughly the same as ShB, SB, and HW content-wise for the very first patch. Seems like they save huge content releases for the .1, .2, .3, .4, .5 patches.