So good news/bad news.
There will be a sixth season of the series, presumably covering the events in Babylon’s Ashes. However, this will end the TV series (the books have three more in the series).
It’s sad, but at least they have a set stopping point, rather than getting cut off mid-story. Book six has a clean(ish) stopping point (the books are basically three arcs tied together in nine books).
Honestly, I was wondering how they were going to handle the time jump at the start of Persepolis Rising. Maybe in 20 years we’ll get three more seasons of the show.