Laura "lelo" D. Arrowsmith Deddens Gerard
Pearland (near Houston)
I see from that image gallery, there is a Tajemnicze Domostwo version of the expansion. Probably only a language difference, but I'd like to get it so it matches my original. Online I only see the Mysterium version for sale.
I believe that Portal Games will have a Polish Mysterium Hidden Signs coming out this month (Jan '17). There is a thread with that info someplace. Let me see if I can find it.
Edit: Here you go: Any news on a Polish version of Mysterium Hidden Signs?