Thanks to Covid, I'm sure plans for Terminal F have come to a screeching halt. I just found this article published 2 days ago about DFW terminal design, "Never built: a visionary plan to rebuild DFW" maintained by a group called AirportHistory.org. It goes into the origins of the semi circular terminals, an abandoned effort to replace them with Atlanta style linear terminals. Fascinating article and website, figured this should go on the Terminal F discussion. Hopefully F won't be "the terminal that never was,"
https://www.airporthistory.org/dfw-rebuild-1.html