I WILL definitely want big box expansions and I WILL definitely buy big box expansions for this game.
We have now played through all of the stories, except Story #5 due to the fact that we did not have 4 players. We have played them all once except for Story #1, which we played twice. Although some people are concerned about replayability I think this game has got replay value. The second time we played Story #1 I only changed my first choice and the game turned out a lot different. If it really starts to become a problem, FFG can always introduce additional clues and/or objective cards for the existing stories/maps. They can also include new lock cards, obstacle cards and exploration cards (items) that can be replaced with those currently in the keeper setup. Including the use of other keeper action cards with certain story choice would also increase the replayability.
I would also like the following in big box expansions:
-additional investigators like Leo Anderson, Dexter Drake and Mark Harrigan (at least 4 new investigators); one or two additional trait cards per investigator might also be good.
-additional tiles; woods, parks, docks (Kingsport) themed tiles would also be great. I also thought that some tiles can include other dimensions. (Even though it's mansions of madness it doesn't necessarily need to play out in a mansion)
-additional monsters; I don't have to say much here - I'm sure everybody wants more monsters (there are so many cool and different monsters in H.P.Lovecraft's themes)
-additional stories with lots of choices for the keeper (choices = more possibilities)
Aside from all of this, how about a book of community created stories/ideas?
Mansions of Madness is AWESOME. Great job Corey.