Hello,
The plan is (and it was like this from the very beginning :) )
Release 1.3 introduces meson officially, specifically with documentation and description in README We noticed that although meson has been added since 1.2, and has users already, it is documented less than it should be. At this point, there could still be some open points as Thomas mentioned.
Release 1.3+1 has meson covering all environments and features that we want. This release will have BOTH meson and makefile, and makefile announced to be deprecated in the next release.
Release 1.3+2 drops makefile.
Greg thank you for your perspective, very much appreciated! There definitely will be enough time between releases, to allow everyone to adjust.
There are more details in the public doc of One Build System Working Group https://docs.google.com/document/d/1TVso_VbrLEbGc7BNrYxqlrP8jMxB23TuMqEI3PnC...