Release of BlueZ 5.7
We had unfortunately a couple of pretty severe regressions that had crept into 5.6 so we’ve released 5.7 earlier than planned. If you’ve started using 5.6 please switch to 5.7 as soon as possible, and if you haven’t yet picked 5.6 just ignore that release 
The regressions in question were related to remote service discovery for newly paired devices as well as the failure to parse some SDP responses (this happened with one Nokia headset). These issues are now fixed and since the last release we also managed to get in patches adding support for a MAP notification dispatcher.