This looks incredible, and I'd love to take a look - but we use Allegro. We've also been experimenting with Orient and Titan. Do you have any plans to support different graph DBs?
We are in talks with Allegro and OrientDB and have clearly planned to develop connectors for these databases.
As for TitanDB, since we will probably develop our OrientDB connector on top of it's Gremlin API [1], it'll be little work to write the TitanDB connector after that (they have a Gremlin API too).
We're also eager to see any binary protocole to communicate with graph databases.