This is a video of the new Icecrown dungeon Halls of Reflection on heroic difficulty. The video shows all of the trash, and bosses and events, at normal speed. It does not show any of our wipes though to save time. We wiped once on the second boss, and multiple times on the final event.

If you don't want to watch all of the trash pulls, here are the times that each boss encounter begins.
Falric - 8min & 30 sec
Marwyn - 15min & 40 sec
Wrath of the Lich King - 19min & 30 sec

I hope you enjoy the video! :]

PS : Sorry for the poor video quality, I had the wrong rendering settings and didn't notice until it was finished. I might upload a new version, but I don't think it will be necessary since the patch is coming out soon.