For those of you with the ACKS PDF, check out the last page. You will find a dungeon level map and this text:
This map can be used in your campaign if you need to stock a dungeon or provide a handout for players who have unexpectedly found a map as part of a treasure hoard. Only the wisest – or those who have been visiting the Autarch website at www.autarch.co, and following James Malizewski’s updates at grognardia.blogspot.com — will recognize that this is also a preview of the legendary Dwimmermount, to be published using the Adventurer Conqueror King compatibility license through a partnership between Grognardia Games and Autarch.
I haven’t seen any mention about the publication of Dwimmermount using the Adventurer Conqueror King compatibility license. Google searches limited to grognardia.blogspot.com don’t turn up anything, so I don’t think I missed an announcement. You heard it here first! (Sort of.)