I know there was another thread but that got bogged down with people misunderstanding what the poster was saying and missing the point.
Blizzard originally stated that the Druid Class Mount would both replace Flight Form and be an optional mount. The main reason for this is obvious to druid players and that's customization! The original idea would have meant that we could still use our original or glyph form and still be able to use Lunarwing as a mount. Currently that's impossible, I have unlocked Lunarwing but because I have Glyph of the Sentinel (which cost gold) I can't use it without removing the appearance I like. I know Blizzard said this was unintentional and can be fixed but the last comment implied they won't bother if people prefer less customization.
Frankly I don't know why Blizzard didn't just make Lunarwing a new ability like the Stag Glyph so people could both use original bird/bat and Lunarwing. I really hope Blizzard does address this