Hi George,
Right now the 1.0 branch is under serious development (see the github commits/PRs there in the last period). We have reached a point where authorization and accounting works, so you can say "pseudo-prepaid" should do just fine out of CDRs and authorization events.
Next in line should be real-time events to debit, so mobile implementation/diameter should work as well. Last will be the open-source plugins like Asterisk/Kamilio/OpenSIPS/Janus, which I think are also just waiting for AutoCharge functionality (which is new in 1.0 and a bit different than in 0.11).
Bottom line, I hope that we will be ready to declare prepaid also functional at ClueCon.
Hope this helps.
DanB