Upcoming Lich King Weapon Changes
A couple of days ago a message was posted on the official Korean site to announce upcoming changes to the weapons dropped by the Lich King, as far as I know these changes affect both normal and heroic versions of the weapons. Thanks to locriani for the help with the translation!
Quote from Blizzard staffGood morning from the WoW community team.

Some of the weapons from the Lich King are not as good as we had hoped. To encourage you to want these new weapons, we have decided to change some of the old combat ratings over to better ones. We have obtained a preview of these changes, for your perusal, on behalf of the Beijing development team.

25-Man

• Royal Scepter of Terenas II: MP5 replaced with Haste Rating
• Archus, Greatstaff of Antonidas: Critical Strike Rating replaced with Haste Rating
• Heaven's Fall, Kryss of a Thousand Lies: Armor Penetration replaced with Haste Rating
• Fal'inrush, Defender of Quel'thalas: Haste Rating replaced with Armor Penetration

10-Man

• Stormfury, Black Blade of the Betrayer: Armor Penetration replaced with Expertise

Lich King Video by Might
Might (US - Turalyon) released their video of the Lich King encounter in 10-man. If you check the first seconds of the Part 2 you will see the Frostmourne room that we couldn't see in the first video I posted.