Generally, the things I write for money stick with what I want to write at the time, and not with upcoming D&D products. The exception so far was Candlekeep Colleagues, which released the same week as Candlekeep Mysteries. (You could also make an argument that my latest product, Gathering: The Realms, fits in, since it was released the same week as the Magic: the Gathering set Adventures in the Forgotten Realms.)
It was a lot of work to get everything done, to make sure it would hopefully fit in with what came out without knowing the upcoming content, and making sure the whole team is on the same page for all of the project can be a challenge.
I don’t have anything in mind to tie in to Beyond the Witchlight, and it seems that there’s been plenty of faerie-based stuff recently (all good, but I just don’t think I have anything to add).
With Fizban’s Treasury of Dragons, I feel like I might have some ideas, but I’m not sure what they’ll be developing for it themselves yet. I have a couple of quick ideas for lineages that I might be able to get written before the book releases in October.
The November release Strixhaven: Curriculum of Chaos is also something I’m not sure I have anything to add to. I’d have to give the book a read to have a better idea. (And honestly I’m disappointed they went with Strixhaven for the next D&D/Magic tie-in setting, since it’s only had one card set plus commander cards – where’s my DMsGuild-legal Dominaria setting book, or one for Planechase that throws out a handful of new settings?)
Hopefully in 2022, there will be something else I want to write a proper tie-in product for.
For now, I’ll keep plugging away at my Princes of the Apocalypse expansion.