At ConnectED a new XPages runtime, a new Domino data service and a new XPages boilerplate were introduced. In order to fit into the Bluemix architecture, to benefit from features like scalability and to leverage other services, XPages applications that are hosted on Bluemix are split into two parts – application code and data. While this separation has been adopted as a best practice by most XPages applications already, the Bluemix architecture now requires it.

via Niklas Heidloff: IBM previewed XPages Applications running on Bluemix.