Hey guys,
I’ve recently stumbled upon these Arduino Nano Every boards that are atmega4809/4808 chip based.
We have not so far had questions about them and we do not support them for now.
I’ve looked into them a bit, and then seem to have 20khz clock and relatively large RAM compared to atmega328. However their PWM capabilities are pretty poor, the support package is not the greatest in terms of pin definition and PWM support. So the support is not as straight forward as I was hoping 
But it there is some interest we could add it to the roadmap.