We'll be sending out an email to driver developers to help them with the Protobuf changes in 1.6 shortly. Shoot me an email (mike [at] rethinkdb.com) and I'll make sure you get on the list.

We also have a Google Group for driver developers (https://groups.google.com/forum/?fromgroups#!forum/rethinkdb...) that you can always ask questions on.

Thanks for working to build a Scala driver, I'm excited to see it!