You mean the update they keep explicitly saying isn't a new edition? The one they have said they internally call "2024 5e" because they're desperate to avoid the stigma they believe is associated with an "X.5e" revision, and even more desperate to make ultra clear that this is definitely absolutely not a totally brand new edition, we pinky-swear?
That's the product they're writing almost nothing for, so they can avoid anger over writing content for a soon-to-be-abandoned edition?
Yes. That would be the one. You obviously understand the tightrope they're trying to walk with it.