Quercus have just sent the first iteration of the Cover to be used with The Demi-Monde: Winter. Although it's only a draft and subject to tweaks I think it terrific: very eye-catching and very steam-punky.
Well, actually not quite perfect.
It seems that the intention is that it should be distressed (which I think is a good idea) and that the various cogs and brass embellishments be toned down a touch (again a good idea). The map used is an old one too so that needs to be replaced. But these tweaks notwithstanding I'm still very happy with it.