Today, The Linux Foundation announced the creation of the JanusGraph project. We're excited to push forward the open source, collaborative effort on scalable graph databases that was initiated by the Aurelius team with Titan. JanusGraph will continue to be a native Apache TinkerPop implementation. The first effort definitely includes finally upgrading beyond 3.0.1-incubating :)

There are janusgraph-users and janusgraph-dev Google Groups created for public mailing list collaboration, but as is the case with other providers in the TinkerPop ecosystem, I'd expect cross-traffic to continue with the TinkerPop lists.