I think so, from Dec 2022, https://www.hollywoodreporter.com/tv/tv-news/henry-cavill-warhammer-40000-amazon-1235283251

This article just adds,

The project recently gained momentum with the assembly of a mini-room, where writers collaborated to outline a creative direction for the series.

This teamwork has now paved the way for the TV series to proceed into development, though a showrunner has yet to be confirmed as negotiations continue.

So I guess progress has been made… But not much.