So I managed to land just about everything needed for the WiFi on the Raspberry Pi 3 for Fedora 26 Alpha (around 4.11 rc3). There’s one thing missing, because we can’t currently redistribute it, but it’s straight forward for the end user to do themselves once they’ve done the initial setup:
sudo curl https://raw.githubusercontent.com/RPi-Distro/firmware-nonfree/master/brcm80211/brcm/brcmfmac43430-sdio.txt -o /lib/firmware/brcm/brcmfmac43430-sdio.txt
Or you can also do it when you’re flashing the image if you mount the root filesystem but the above is likely easier. It’s been surprisingly stable in my testing.
Before you all ask, at the moment I don’t plan on pushing this to earlier Fedora releases, as the upgrade path is not trivial. I will also soon publish more details of some of the other new features coming for the Raspberry Pi to Fedora 26 but I thought you’d all like the WiFi details now. The wiki has also been updated to reflect the status of the WiFi.
PS: No this is not an April Fool’s joke (it’s well past midday in UK).