Glad they will finally be coming soon.
As for the possibility of different mounts other than the yellow birds we have come to love, I'd prefer it if we are just given a wide array of different types of Chocobos rather than different mounts.
I think the people who think that having only Chocobos is robbing FFXIV's chance of being more diverse are forgetting that while diversity is nice, Identity and Originality is better in this particular case. Other MMO's have other mounts. XIV could have other mounts in the sheer amount of chocobo options. Not even just color or armour/clothing choices. If you go back and look at the Chocobo artwork througout the years, you will notice how different the designs were. Even if it was a longer beak, wider wings, bigger feet, longer neck, etc. It was still noticeably different. A good example are some of the chocobos in FFXIII the ones with those really long ear feather things. They looked a lot wiser, as if to say Chocobos are these mysterious knowledgeable birds who have walked the earth for thousands of years. I think thats kinda cool. Plus, there is nothing stopping Yoshida from walking into the art department and asking people there to come up with a whole bunch of new designs for chocobos.
When I played WoW and I would look at someones epic shiny dragon mount, sometimes I would think "Man! I want one of those!"
FFXIV can still provide that feeling with only Chocobos in the mix. "Woah, his chocobo is way bigger than the usual! It has glowing blue eyes, some sick ass looking armor and has a completely different running animation!"
Right now, the devs need to focus on making the game feel more like a Final Fantasy, something that has been admitted by a large part of the community. Adding in other creatures as mounts may serve to do the very opposite. Other mounts can still make it feel like a Final Fantasy game but its a very touchy and delicate matter that can't just be carelessly implemented. Maybe later down the line when the game has some years on its belt and is much more established. Maybe then, they could add some other stuff in when its already established as a great Final Fantasy game. But no, for now, all we need are Chocobos.