As Adapt is an open source project that relies almost entirely on people's donated time, we've learned from past experience that there's no point giving out timelines for roadmap features - since it's just too hard for us to meet them without guaranteed resources being in place.
I can see from the milestones page on github that it is scheduled to be part of the 0.2 milestone - which is the next milestone they'll be working on once the current one is done.
If you are able to offer any assistance with this - or any other feature of Adapt - please do let us know. In particular there's a gitter room for discussions about the multi-user functionality you can join.
There's also a post here that might be of interest.