Total War: WARHAMMER III has just released although only supported for Windows, with the Linux release due out "in Early Spring".
The way it's been handled is perhaps a little confusing, if you don't fully read the Steam page. It has a SteamOS icon on Steam (to show Linux support), plus a system requirements tab at the bottom of the store page. However, down below the buy button a bit there's an Update Notes section that reads "Total War: WARHAMMER III will release on macOS and Linux in Early Spring" and the same is noted in the system requirements.
So if you were wanting the Feral Interactive port, you're in for a bit of a wait. We've reached out for a review code, but it's not clear if we're going to be getting one. Feral told us they "may" have keys when their version is live, and we haven't heard back elsewhere. It's possible it may run with Steam Play Proton, which you'll probably need for cross-platform multiplayer as previous entries did not have it, a question Feral has still been dodging from us for Total War: WARHAMMER III.
In other Feral news, their Linux port of Tomb Raider was recently delisted from Steam.