For what it’s worth: It seems that resources at Failbetter are stretched incredibly thin. As far as I know, only Olivia and James are working on FL (but not exclusively) and with the Vagabond-update released last week and the Election (probably?) starting next week, it’s probably really difficult to find the time to go through the entire process of releasing the seasonal conclusion.
That’s definitely no excuse, but it’s relatable that under those circumstances the bonus content has less priority than other content.