Liberty admin services are based on MBeans, which are remotely Java accessible via restConnector.jar. The underlying protocol/transport is REST/HTTP. However, the REST/HTTP interface is not currently documented as a public API. We believe there would be a wealth of possibilities by formalizing and documenting the API such that non-Java clients would be able to access MBeans over REST/HTTP.
To demonstrate the kinds of things you could do from a non-Java client, we built a mobile application which shows the status of all of the clusters in a Liberty collective (simulated on iPhone 5):