Thanks! We look forward to integrating GitHub – there's a ton of cool stuff that can be done, as it's very common that a box maintainer has Packer templates, configuration management scripts and so forth there.

We didn't go the OAuth route primarily because we need to enable `vagrant login` locally, and for that it's useful to have a login/password combination, authentication tokens. I couldn't think of a workflow that makes this as easy for a user.