So.. what happened to Flying Tank mounts?

[Reiryuu]

Pretty much, although I did hear resources were ready for a Ramuh-egi come Stormblood.

Also, how about healer mounts before we start giving tanks even more love than they actually need?

OMG I thought I was the only freaking person in the whole world who thought this way T_T; I'd even be happy with something other than a mount. Just give healers something since there's no healing job and tanks are getting more freaking mounts =/

can be translated in several different ways, from 'we are preparing a top exclusive tank mount' to 'we are readying a mount for advanced tanks'. Note that it says only about one mount, so it can be an upgrade to existing achievements, like complete 1000 high-level duties on any tank job Mentor mount-style.

Not really, he's basically saying they're prepping mount(s) for tanks for high end content. I was pretty sure he mentioned mounts in one of the fan festival keynotes, but I can't seem to find it anymore. =/ But it's unclear from the quote you mentioned whether it'll be one or multiple mounts since Japanese doesn't really use plural forms unless you want to make a number clear for whatever reason. The post I was looking for had a slide or at least an official English TL with multiple mounts.