From the update:
We have put everything gameplay related into a single bundle "De Vermiis Mysteriis" for only $525!!! This makes it simple to get all of the gameplay items (including the 6-8 player map) and save money! See Pledge levels for more details!
Also, if you are on a budget but want choices, we also added the "The Book of Eibon" bundle for only $325! This gives you more freedom with the Player Marker and you can pick THREE out of the seven possible expansions. See Pledge levels for more details!