dabs We'll start publishing first betas about this week, maybe next one. Full list of updates is to be published yet but major ones are:
New platform support added: Sailfish OS ( sailfishos.org/ ) Support for all latest iOS and Android updates ( iOS12 and Pie ) Support for new Android build tools ( NDK 17) QT 5.9 for RhoSim and desktops FCM push support for iOS
You might use an older targetSDK if your app cannot tolerate some change(s) of behavior in recent versions. I would try 28 first, assuming you have a device or simulator to test it with. If you set it to a lower SDK, then the OS will adapt and will treat the app as if the older version is on the device.
You can set maxSDK as well, but then that prevents installation on NEWER OS, and is a very rare need.