Winter Veil is here, and the various Christmas quests (which I'm too busy to spend oodles of time documenting :( ) abound, and so do the Reindeer mounts.
How To Get A Reindeer Mount
Complete quests during the Winter Veil event - some reward Preserved Holly
Misc, UnknownSubClass#3
Requires Level 40
Use: Transforms your mount into something more festive.
Charges: 1
Item display is courtesy world of warcraft.allakhazam.com. ',VAUTO,HAUTO,FULLHTML);" onmouseout="return nd();">Preserved Holly or Fresh Holly
Binds when picked up
Requires Level 40
Use: Transforms your mount into something more festive.
Charges: 1
Item display is courtesy world of warcraft.allakhazam.com. ',VAUTO,HAUTO,FULLHTML);" onmouseout="return nd();">Fresh Holly which can be used on your existing mount to change its appearance temporarily.
There is no permanent Reindeer mount.
Preserved Holly
Misc, UnknownSubClass#3
Requires Level 40
Use: Transforms your mount into something more festive.
Charges: 1
Item display is courtesy world of warcraft.allakhazam.com. ',VAUTO,HAUTO,FULLHTML);" onmouseout="return nd();">Preserved Holly can be stockpiled and sold in the Auction House - buy up a bunch and save them for July, then list some in the AH and buff your own mount and sit in the city during a busy day - a little bit of advertising should do the trick!
Watching Others Fly Their Reindeer In Outland
I know there's ways you can change your WoW configuration files slightly that will allow you to go completely belly-up on your flying mount, enabling you to (fly upside down?) do a complete "barrel roll", but I haven't tried it myself.
I got a chance to see someone in action on their Reindeer in Shattrath City, however, and got some good screenshots of it. Here's one of the best ones:
