This happened on Reddit a few days back. I'm ashamed to say I had no idea it was going on until after it had well and truly ended. He answers a ton of questions at length, too, which is always awesome in an AMA.

[URL="https://www.reddit.com/r/Warhammer/comments/7igatt/im_aaron_dembskibowden_ask_me_anything/"]Aaron Dembski-Bowden Reddit AMA.[/URL]