Good bye farming holiday bosses...
As posted to Wow.com, changes coming down in patch 3.3.3 will drastically change how you get into a holiday boss.
As lock, I was often utilized in guild, to summon everyone's alts, their brothers and kids toons. Great since I "could" get my warlock flying mount, with EACH possible kill. In 3.3.3, you use the dungeon finder, and only get the 'rare' drops on the first kill.
As Wow.com points out, maybe the individual drop rate will be higher than it was previously. Personally, there is nothing I'd love more than a flying felsteed. IMHO, every lock should already have this mount.