The store opens with 200,000 books that can be purchased, along with close to 3 million free public domain books, and both totals will be growing in the future. Books that you start on one platform can be saved and opened up at the same place on another platform. The "store" can change between "day" and "night" looks with the ability to change font style, size and spacing. The prices for reading material range from $1 to $300 while new releases are priced from $10 to $15. The app will read only those books purchased from the Google eBookstore.
source: Googlebooks via androinica