So end of last year, we got to:
We've started work on notifications and branching and launched the first part of the notifications work, namely the unread count displays.
Our goal is to finish up notifications and a couple of other things in Q1 and finish branching in Q2.
Because these are crucial to effective team use, we'll continue to run the ThoughtStreams for Teams Beta during that time with a view to launching teams publicly in Q3.