I'm curious: when will D2 be declared stable?

[The Anh Tran]

In my limit knowledge, D2 has invariant+pure integrated already, to 
support functional paradigm. Is there any 'feature', cooking in 
backyard, so that d2 can't be declared stable?

This is purely speculation:
1. Concurrent support?
2. Operator overhaul?
3. Add more paradigm??? :D
4. Something to assimilate Martian people? :D