New release for rtMedia, version 3.6 adds JSON API in core. 🙂
Using this API you can login to a WordPress/BuddyPress site remotely and upload media. If also has user registration method to create new users in WordPress.
Overall, this enable developers to create mobile apps as well as third party services for rtMedia. If you need any extra methods in API, just raise a support request in forum, or even better send a pull-request on Github!
rtCamp has no plans to develop its own mobile apps for atleast 1-2 years. So if you develop some mobile app, that works nicely with rtMedia enabled sites, we would love to review and promote it to rtMedia user-base. Just get in touch with contact form.