Since the question popped here and there, I'll post a short blog post about the issue right now so there's a reference somewhere.
As you may know, Brad Spengler (spender) and the Pax Team recently announced that the grsecurity test patches won't be released publicly anymore. The stable patches were already restricted to enterprise, paying customers, this is now also the case for the test patches.
Obviously that means the end of the current situation in Debian since I used those test patches for the linux-grsec packages, but I'm not exactly sure what comes next and I need to think a bit about this before doing anything.
The “passing the baton” post mention a handover to the community (though the FAQ mention it needs to stop using the term “grsecurity”) so maybe there's some coordination possible with other users like Gentoo Hardened and Alpine, but it's not clear what would be possible with the tools we have.
I'm actually quite busy right now so I don't have much time to think about all this, but expect a new blog post when things have settled a bit and I've made up my mind.