I am curious about this as well. Have been looking for a copy of the apk to try but no luck so far. Maybe someone on the forum has a FireTV and would be willing to supply a copy of the Netflix apk. I have seen that the OUYA controller works good with the FireTV so there this could be a good alternative to what versions we have to sideload now.
Edit: It will load but just sits on the Netflix loading screen with no data traffic.