And after that, i think also that it will be just an compatibility work time as he said for O.
Globally as i see on AOSP, the compilation works way is not very different of N, just several changes in accessibility systems, SELinux policies and some UI changes..
Where I am rather worried but that will not concern me, it is for compatibility with the official Samsung ROMs and maybe even Sony.
Each new major versions of patches anti root patches are set up.
Remember also the time it took rovo for compatibility for the 5.x.x Samsung update, and imagine now the work to be done, all done on a voluntary basis.
I purposely extrapolate my remarks a little, but it is so that you will be well aware of the mass of work done upstream.
I tell you to you as to all the others whether they have donated or not, rovo is really really a good person to haven't abandoned the xposed project in short of road because it could have had to resume all the work starting from 0 ..