FUD, not a single source working for MSFT has said a damned thing about a subscription model, THAT bit of FUD was started by a gossip site "El Reg" IIRC that is known for pulling "facts" out of their ass.
The ONLY thing that has been said is they won't have the old service packs anymore, instead you'll have a point release, like 8 to 8.1. This makes it easier for regular folks to know WTF is going on as its easier to know that X.1 is the current version as all the sites treat it as a separate OS, while nobody talks about "Win 7 SP1" they simply call it Win 7.
But just because some dude at MSFT said "Win 10 is the only version we are working on ATM" the sites jumped to this "last version of Windows EVAR" subscription crap when in reality land the prices have already been leaked and its no different than every other release, you'll have retail and OEM, Home and Pro, its business as usual. I'm sure in a year and a half you'll see retail 10.1, maybe even 10.2, and then you'll see the hypetrain for Windows 11, probably hosted by Spinal Tap, coming to a tech site near you.