I have bought an iPhone 5S on eBay, which I hope will serve as my new test device. The last one I bought had not been reset properly, and I had to send it back. The iPhone 5S is the oldest model that still runs the latest version of iOS.
In the meantime, I am working my way through a cloudkit tutorial, and have I discovered that I may be able to test iCloud apps on the simulator as well. If all goes well, the new release should be ready by the end of the month.
Although iCloud support is the most pressing issue, the most important one in the long run is an analogue for the navigation drawer in iOS. That will involve redesigning all the existing storyboards, and I am hoping that my new development system will help with that.