Researchers "are now investigating changes and patterns in buzzing which might indicate health disorders, or deterioration in the hive." One potential result of the research is an electronic device that can measure colony health without the need to open a hive.
http://www.thisisnottingham.co.uk/Buzz-clue-bee-haviour/story-18299496-detail/story.html (http://www.thisisnottingham.co.uk/Buzz-clue-bee-haviour/story-18299496-detail/story.html)