in case you've not seen the announcement on twitter, Rob announced that the sources for v8 and v10 have been released:

https://twitter.com/rob_pike/status/846780261350096896

you can find everything here:

http://www.tuhs.org/Archive/Distributions/Research/

0intro has instructions on how to run them on SIMH. lastly 0intro sent out instructions on how to use ɔıuɐd‾ʃǝuɹǝʞ's Blit terminal emulator on Plan 9 to access those unix distros:

http://minnie.tuhs.org/pipermail/tuhs/2017-March/009440.html

-Skip