I think Brevoy would be a sort of awkward one for them to drop a book for now – when they first started printing Brevoy content, it was 2008 (4708 in-universe) and it had been 9 years since the Vanishing, and the equilibrium they described was semi-believable for “it’s been less than a decade but things haven’t broken down yet”, but if they printed one now, in 4726, a full 27 years since the Vanishing + Noleski Surtova taking over, that’s – a fairly long period of time to have ruled without meaningful changes? And it would make the country feel – weirdly frozen? – if they printed a Brevoy book where there were still the same tensions, with fairly few meaningful changes other than the ones they’ve already declared to have happened
(conversely, Noleski Surtova not marrying for 9 years to consolidate power is a bad decision, him not marrying for 27 as the king of a hereditary-ish monarchy and also not having any other plan for succession, adopted heir, etc. is just terrible decision-making)