What this means exactly is that the download server will also serve development builds o openSUSE Leap 42.3 if they are good enough for testing, besides the latest OBS builds. However, you should know that this doesn’t mean that openSUSE Leap 42.3 will follow a rolling release model because that’s what openSUSE Tumbleweed is designed for. According to Mr. Nussel, the rolling development phase of the openSUSE Leap 42.3 operating system will stop when the GM (Gold Master) build hits the streets, which should happen sometime at the end of July 2017. openSUSE Leap 42.3 will be based on the commercial SUSE Linux Enterprise 12 Service Pack 3 (SP3) OS.