I fear this will mean kexts (kernel extensions) will be impossible in the near future, further limiting users' abilities and tightening Apple's control. :(
Looks like <a href="https://en.wikipedia.org/wiki/User-Mode_Driver_Framework" rel="nofollow">https://en.wikipedia.org/wiki/User-Mode_Driver_Framework</a>, but for mac.
A nice nod to NEXTSTEP :) (in name, and I suppose somewhat in the original and largely unrealized microkernel philosophy of having more things in user space)