After all the rumors, unfortunately today it was made true.
Grsecurity is no longer publishing public testing patches: https://grsecurity.net/passing_the_baton.php
Personally I am very unhappy because of this move, but it is very understandable when looking it from grsec's side. People have often tried to (badly) upstream some of their patches, and never contributed back, or credited Grsecurity for the work done. Spender & co. have had enough of it.
Well, linux-heads is currently based on the 4.9 kernel branch, which is also the last public patch given from Grsecurity (4.9.24). I will continue to maintain heads with this kernel until the support for this branch ends (January, 2019). This will hopefully give a timeframe big enough to figure out next moves.
In the meantime, heads will focus on the more important parts of the roadmap,
such as becoming completely libre by blocking
non-free, and more
secure userspace by hardening binaries on compile time. Since GCC 6, PIC/PIE
were upstreamed and default by now, but there is still more we can do about it.
On another note, Kees Cook and other certain people are trying to mainline some code, part of which can be seen here: https://lkml.org/lkml/2017/4/25/900.
~ parazyd (2017-04-26)