They are already ready,

but I have serious doubts about that. Only the HotA and WoG teams have the tools to implement a new city.

but the project seems to have stalled.

After that, many breathed a sigh of relief :D
(simply - the graphics are very unsettling; the units are fine - they are taken from the M&M games, but the city screen... well, what can you say? :) )

Added 5 minutes later
since we're talking about cities:
yesterday I added a few more examples to the thread about the add-on on our forum - for all three new cities - their "main" units (pirate, inquisitor, northern dwarf) in the recruitment window, and also a fragment from the Cove screen.