The mount will be slower than the level 35 variety, but will be usable from level 25, so it is intended to speed the traveling of alts. If you are a Founder (had pre-ordered the game before release) or have a Lifetime account, check your inventory for a receipt to hand in and get your Bree Horse.
However, it's not just lumps of coal for everyone else. There will be a holiday promotion for the rest of you coming soon, and some other rewards programs for subscribers (possibly like what is used in EverQuest 2) are being planned for next year -- and there's the already-revealed discount offer for monthly fees. 'Tis the season to be thrifty!