Behringer have also not released any major updates for their X-Air series (apart from recent bug fixes) for over a year so not just A&H.
As Bob says, there has been no official announcement from A&H regarding ‘end of development’ so I’m hoping they’ll at least finish adding any missing features on the iPad app like Spectrograph. Anything in addition to this would be a bonus but I’m not expecting a lot more as apparently the processing space is pretty full already! There are a few refinements that could be made to improve workflow etc but the QU series mixers are pretty comprehensive already.