This rough version is the closest thing to a release we’ll see

Corroborated by 2 sources from 2 publishers

globalgeneral1h ago

TL;DR

Leakers have pieced together a playable version of the canceled Portal prequel F-Stop.

The Verge (Tech)

https://www.theverge.com/games/1024206/playable-portal-prequel-f-stop-leak

Engadget

https://www.engadget.com/2303446/all-the-leaks-for-the-portal-prequel-f-stop-have-been-compiled-into-a-playable-game