Apparently I wasn't too far from reality with my predictions, Blizzard seems to want to release a new wing every 2 weeks and the Lich King should be available during the first or second week of February. The Arena Season will end on January 19th and Patch 3.3.2 will be released in January.
You can still check the Icecrown Citadel - The Lich King preview but be careful there are a lot of spoilers here.
Update Next Icecrown Wing in 2 Weeks
[blizzquote="Bornakk;http://blue.mmo-champion.com/12/22418862307-new-content-today.html]Then the next wing of Icecrown Citadel opens in 2 weeks. [/blizzquote"]
End of Arena Season 7 Coming Soon