All,
The next (and final) milestone has been built - check out the release notes of openHAB 5.0 Milestone 4 here:
With this milestone we have reached the feature freeze - from here on, we plan to only merge bug fixes (unless there are strong reason for anything else). Please help us to identify any bigger issues that might still exist in the code base to make sure that the final release is as stable as possible.
Talking about the GA release, there is a slight adaption to the earlier announced schedule for personal timing reasons: While the RC1 is still planned for July 18, the GA release will be postponed by one day to July 21 - I hope you are ok to wait one day more for it. 
As usual, please use this topic for any discussions around our 5.0 milestones.