Planescape: Adventures in the Multiverse book details
https://ttrpg.network/post/151121

Planescape: Adventures in the Multiverse book details - The TTRPG network
It looks like this will also follow the template of the Spelljammer books, with
some player options, setting information, and DM facing content (adventure &
creature statblocks).
Having played Planescape: Torment for the first time back in 2018, I’ve been wanting to run a game based in Sigil since then. Currently resisting the urge to pre-order rn, ugh.