Last few days I spent with porting mender (http://mender.io) to OrangePI-PC-Plus board. All my work is currently merged to meta-mender + mender so owners of OrangePi can build images without additional hacking.
https://hosted.mender.io to speed up testing and avoid installing local mender server). Web interface is really nice and user friendly so you can easily create deployment for your devices and push update to them. I'll post in few days update with details how to setup update. Stay tuned.