Given that the lenses are (definitely) manual focus with (I'm 99.9% sure) zero electronics, I think they should work fine. The camera doesn't need to know anything about them in order to give you a 10x mag focus check or a focus peaking display. If they do have electronics, it'd just be to identify their model name I'd guess, and once that works I don't think the protocol would change. (I've been doing computer protocols since the 1980s.)So, if third parties start releasing RF autofocus lenses would you invest in them? I certainly wouldn't. Maybe they would work on the current body - but will it still be useable in five years time?