Acknowledging the incredible creativity from Coldplay, my theory here is that FFTF is "Flight For The Future", and it going to be 3 releases, in sync with Nasa Artemis Mission.
Artemis I, expected to launch on November 2021, Artemis II expected to launch on October 2023, and Finally Artemis III expected to launch on October 2024.
I know, November 2021 is quite far away...
I'm not saying that they're going to release an album like "Los Unidades", in fact, Guy confirmed in an interview that they were working on a LP like Coldplay. I think that "Unsold ideas" could be a hypothetical clue.