We’ve got some internal use cases would would be great as Vagrant plugins, but would much rather wait to target the presumably cleaner 3.0 Go-based framework. Ruby is not gonna happen. (We’ve also had issues with bundled Ruby runtime for windows users, but that’s a separate topic.)
Anyway, can any of the HashiCorp folks provide an update in terms of project direction and when (if?) we can start building Vagrant 3.0 dev versions of off GitHub for testing.