* a month ago, rumor discussion
on this forum (24-300mm-equivalent, f/2.8-5.6, better battery, UHS II V90 support, $1980 U.S.).
Why are you quoting an April Fool's post as being relevant?
IMO that post / those specifications are about as relevant as anything else I've seen. They're all somewhere on the spectrum of plausible speculation at best, to ridiculous fantasy or parody at worst.
I've long been a fan of the RX100-series. And I think there's a profitable market for a putative new RX100 with the latest-and-greatest AF, a truly useful touchscreen, and maybe a bigger battery. For the lens, I think arguments can be made for the existing 24-70mm f/1.8-2.8, the existing 25-200mm f/2.8-4.5, a new 25-300mm f/2.8-5.6 (as Fooled), or (my personal favorite) a new 24-105mm f/2-4.