Apparently, Season 2 of The Expanse will land on Netflix UK on Friday, 8 September.
The second season of the show, which airs on SyFy in the US, originally aired from February to May this year, and was anticipated on Netflix in June. Bizarrely, the streaming service has held off on broadcasting the show, resulting in both significant levels of piracy and also people perfectly legally buying the already-released DVD and Blu-Ray box sets. The reason for the delay is unknown.
It's also unclear if the entire season is landing in one go (which you'd assume would be the case) or will be stripped over thirteen weeks like in the olden days.
Fortunately, Netflix's laxity has not damaged the success of the series: production of Season 3 began a few weeks ago and is now well underway, for broadcast in 2018. The Season 1 finale also picked up Best Dramatic Presentation (Short Form) at the recent Hugo Awards in Helsinki.