We have had an introduction of sorts to every new playable race so far except Hrothgar. With Au Ra we were introduced to them through the MSQ with Yugiri. For Viera we had Fran in the Ivalice Raids.

Would it be possible, although probably unreasonable, to have a small quest before 5.0 that introduces them to the game? Say maybe a small side quest where we rescue one or two of them fleeing some Garleans?