It isn't publicly available yet, not because we don't want to share it but because we haven't defined how to share it. We'll soon have to improve how we gather feature requests and bug reports from the community, maybe by using some of the many tools available for this purpose, so when we do that the roadmap should be publicly available.
Though, even if we had a roadmap available, it would be no guarantee of the features making it to the release. It has happened to us before that we had to leave some features out of a release.