We have now killed The Lich King on hard mode in 10-man Icecrown Citadel. Good job everyone who were on the kill and those who participated in the endless strategy discussion.
The encounter had a bug in the spirit phase which we reported 2 weeks ago but it didn't get fixed until today (the bug made the encounter very hard). We had worked our way around the spirit problem on last week's reset and the kill was within our grasp even without any extra attempts or buffs. We had the 5% buff on in the kill.
A video will be released at a later date (tm).