We ran our livestream of the Halls of Reflection on the PTR yesterday, and other than one little hitch (I figured I'd save us all the trouble of raiding the Lich King and just jump in and take him down myself, with disastrous consequences), it went pretty well. Turns out you need to run through the main quest to unlock the last two Frozen Halls instances, so we ended up doing all three: Forge of Souls and Pit of Saron on normal, and then the Halls of Reflection on both normal and Heroic. On the way, you can see all of the bosses, dropped loot, the various lore and questlines that weave throughout the new 5-man, and the final epic confrontation.
Obviously, considering this is straight video of these instances (with commentary and audio from the game), these things are full of spoilers -- if you don't want to know what happens when you enter Icecrown Citadel, steer clear. That said, the video we recorded is after the break. You don't have to watch the whole thing (in fact, at over two hours, you'd be crazy to), as I've tagged the Forge of Souls run, the Pit of Saron run, and the final heroic Halls of Reflection run on their own. Clicking those links or the markers on the video below should take you to the specific parts of the video. Enjoy.
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.