Also looks like more Mechanicus in some form. Judging by the trailer it may be a new transport, 30k-to-40k rules or just a fluff piece to introduce the Iron Hands, we'll see.
What looks to be a proper Chaos Knights codex is the bigger surprise though, although in hindsight, it was perhaps inevitable since they couldn't stay as an Index forever.
Tech themed campaign on the horizon maybe?
Edited by Lord Marshal, 04 May 2019 - 10:10 AM.