From the Kintaii interview:
Thanks for that blurb, looking forward to doing something newPG: "When will it go live?"
BM: "Both the Collector's Lair and the new Daily Missions system will be going in with the next available content update for AO, which should be hitting live servers within the next few weeks. These have both been a long time coming, and the team is really looking forward to seeing players enjoy the new content."