In /contrib/miller there is a new 9pi.img.gz which extends native wifi support to the new Raspberry Pi Zero W, as well as the original Pi 3. For convenience there are also new 9pi and 9pi2 kernels, and updated 9/bcm source.
The wifi driver is now configured into all the pi kernels, but it will only be enabled at boot time if cmdline.txt explicitly includes the definition ether1=type=4330
