We hope to release RapidSMS 0.15.0 next week. If you'd like to check out what's in there, get the develop branch from github and take a look. The 0.15 release notes list what's new. And you can see which things might still get added by looking at the 0.15 issues list in github, here:
https://github.com/rapidsms/rapidsms/issues?milestone=7&state=open
Big features so far:
* A new, simpler way to configure which handlers to load. (The old way will still work for a while, but is deprecated.)
* A tutorial for getting started writing RapidSMS apps.