Importing old notifications
I imagine this just got enabled on mw.org. Very initial impression is "cool".
One thing I do notice, is my list of currently unread messages is now "gone" (well not really since i can still type in special:newmessages by hand). My old notifications are important to me, and I imagine others feel the same. I think old unread messages from lqt should be imported into the new system to avoid disruption.