At midnight tonight, the Dark Portal opens and Burning Crusade goes live.
If you're below level 35, this matters to you only insofar as there are some draeni or blood elf questgivers around that weren't before. If you're between 35 and 58, your profession trainers might have some recipes they didn't before. For the 58+, there's a new area to explore...and if you're 60, you get to earn XP again.
It's the end of the world as we know it, and I feel fine.
Gelato is parked just this side of the portal.
I'm probably not getting mine till the weekend, but at least Altariel will
be able to get XP again. :)