That interview was done before Heavensward came out, I'd wonder if they're still planning to follow through on making the primal horses fly since they decided to start doing the birds for the HW EX primals? They made Kirin and the others mentioned flyable months ago. Most of the other things have been completed too aside from bunny ears for men and the FC alliances (which I figured they'd be saving for whenever Ishgard Wards finally come out). It wouldn't be the first thing that got delayed for well over a year though so who knows.