rviz porting has already started, first by @bponsler:
And then by me and some other developers, see:
And:
The latter work (that I’m involved in) is still a work in progress, but we’re close to having a usable rviz application in the ros 2 master checkout and some version of it will definitely be in the release at the end of this year.
I’m not aware of anyone working on AR stuff yet, or integration with third party libraries or hardware.