OpenSUSE 42.3 will be their first release developed without alphas and betas, instead treating it as a rolling-release up until the official release. Packages going into the rolling release, similar to Tumbleweed, will first be vetted by OpenQA with automated tests. OpenSUSE Leap 42.3 will be released at the end of July, when it will stop being a rolling-release while the stop of bigger package updates will be halted on 21 May and the package freeze will begin on 25 June.
OpenSUSE Leap 42.3 won't be a big release over Leap 42.2 but will be "service pack alike refresh." More details via SUSE's Ludwig Nussel message on the mailing list.