Pre-production is well underway on Season 5 of The Expanse, with the cast and crew gathering today for the table-read of the season. Actual shooting should start in the next week or so.
Season 4 of the show hasn't even aired yet, but Amazon renewed the show for a fifth season several months ago as part of a new policy meant to reduce the ever-widening gaps between seasons of premium TV. Shows like Game of Thrones, Westworld and Stranger Things have seen gaps of eighteen months up to two years between their last few respective seasons, a result of the need to see viewing figures, then shoot the series and then undertake the increasingly elaborate post-production work needed for these shows to look as good as they do. Amazon's new policy saw them greenlight a second season of The Boys before the first had aired, and there are signs that they will do the same thing for Wheel of Time and Lord of the Rings: The Second Age, now both in production in eastern Europe and New Zealand respectively.
Season 5 of The Expanse is expected to draw heavily on the fifth and sixth books in the series, Nemesis Games and Babylon's Ashes, and will air in late 2020.
Seasons 1-3 of The Expanse are airing now worldwide on Amazon Prime Video now. Season 4 will be released on 13 December 2019.