The upcoming major version 4.1.0 is going to be out in about 2 weeks. A dedicated branch, named 4.1, has been created for it.
From now on, the master takes again code with new features to be part of future release series 4.2.x.
The main focus is still on testing 4.1. For those interested, wiki page containing the draft with the list of new features in Kamailio 4.1.0 is available at:
Instructions for installing v4.1.x from GIT:
Stay tuned for the announcement of the release date for v4.1.0!