Here's an estimated, rough time frame for SUSECon '15 session information:

Approximately March - Call for Papers will open
Approximately May - Call for papers will close
End of May or Early June - Sessions will announced
August - Session Scheduler available

These are just current plans and are not set in stone. Just FYI. Expect the session page of the web site to be updated according to that timeframe. Until then, last year's session information will be available for reference and to give you an idea of the type of sessions that will be available.