I would really like the winged guardian, but I'm waiting to see how popular it is. I remember I almost bought the celestial steed on the day it came out and before I logged in. I couldn't find my card or something so I logged in anyway and saw one. Then another. Then another three. Then realised Dalarn was crawling with them. So was Org. And all the leveling areas. Now I'm glad I didn't get one.
I know some people get all huffy about people who say this - the whole "If you like a mount it shouldn't matter how many other people have it" arguement. But part of the appeal of these mount is that they "look awesome". Things lose the ability to "look awesome" when they are very commonplace - people were awestruck by the cinema, TV sets, washing machines and, more recently. 3D movies. People would gather round rich peoples' windows and peer in at TV sets when they first came out because they were so amazing. Now they are so common place that we give a new TV set about as much admiration as we might give a new coat or a new pair of socks. Same thing with the celestial steed and, I suspect, with this mount. It looks amazing in this vid - flying solo through SW, but if that video was the thing flying through SW and passing by about 30-40 other people on identical mounts it would suddenly look a bit ridiculous.
So I'll probably pass - and if you buy it, more power to you. Maybe you are a bit less shallow than me. Or maybe a bit more, I'm not sure.
I just wish they would make a new new set of mounts that were cool and that I could work for on my own. My guild is kinda crap at killing final bosses in raid tiers and my ability to make gold is pathetic - and I'm getting bored of my netherdrakes.