#1 - Nov. 20, 2010, 1:08 a.m.
Blizzard Post
In preparation for the new flex lock system we’ll be wiping the following raid locks at the time of the next patch release.

Onyxia's Lair
Naxxramas
Ulduar
Obsidian Sanctum
Eye of Eternity
Vault of Archavon
Trial of the Crusader

This means that if you've extended a lockout for these raids it will be wiped at the time of the next patch. This does not apply to Icecrown Citadel or Ruby Sanctum as they already use the new flex lock system.