Don't Forget To Re-Enable BTMM
If you use Back To My Mac (I do) then you'll find that your sessions have been invalidated on all your devices. So, make sure you have local access when you upgrade your firmware so you can re-authenticate to iCloud.
Still a bit silly of Apple to have forgotten AirPort. About the only genuinely competent product that I can unreservedly recommend to people …
And yes, powered by NetBSD. Rock solid too, unlike much of the generally available consumer crap running Linux (it's the higher-end business kit running Linux that's any good for anything). I use a Draytek router in combination with AirPort.