This is the GitHub repo for Adafruit BBIO for those interested in
Adafruit_BBIO development:
https://github.com/adafruit/adafruit-beaglebone-io-python
I did start looking last week at how to enable ADC and PWM in 4.x
kernel (Debian 8 image). However, the solution needs to maintain
compatibility with 3.8 kernel (Debian 7 image).
There is a pull request to ADC working but it breaks compatibility:
https://github.com/adafruit/adafruit-beaglebone-io-python/pull/83
You may also want to check out Alexander's PyBBIO:
https://github.com/graycatlabs/PyBBIO
He is also working on 4.x kernel support:
https://github.com/graycatlabs/PyBBIO/milestones/4.1%20kernel%20support
-Drew