After doing a bit of searching myself, I've stumbled across several people who have said that Empty Planet was essentially Brave New World renamed for legality issues. However, I found that the description of Empty Planet in the episode itself reflected only the generalized ideals in Brave New World. If you're really expecting a book where the machines have over run society and that the only salvation of human kind is an army raised by a twelve year old, you may be disappoint. More than anything, I believe the connect may be the metaphorical ideals behind the books, not an actual specific description of the book.