We don't currently have any public SDKs. We do have plans to release one in the future and will make an announcement when we are ready to do so. We need time to test it, document it, and make sure that we support the tools that third-party developers want to use.
Our main focus is to release an SDK to support Unity3D. After that is stable and released we will investigate supporting other languages based on feedback from developers. If you have a language you would like to see supported, please leave us a comment!
Thank you for being patient.