After GNOME 3.19.1, the GNOME 3.19.2 milestone will arrive in November 25, followed by GNOME 3.19.3 in December 16, 2015. The development cycle for GNOME 3.20 will continues in January 20, 2016 with the GNOME 3.19.4 build. Then, the first Beta build of GNOME 3.20 should be available for testing on February 17.