There are still several hours to go until the patch goes live, so until then, check out our Patch 3.3 resources:
Update: We will be seeing the trailer tomorrow (not tonight).
Patch 3.3 is the last major patch of Wrath of the Lich King. With the new Icecrown Citadel 5-man dungeons and 10/25-man raid arriving soon, patch 3.3 will deal the final blow to Arthas. WoW.com's Guide to Patch 3.3 will keep you updated with all the latest patch news.