I bought this book without knowing anything about it as I think Dan Brown is a very talented author and the research for his books is unmatched. I was strongly hoping for something besides another Robert Langdon book - he has a couple others outside of the series are quite good.
This book definitely falls into the same story arch as the other books in the series, especially Inferno. But that being said it is still a great read with an intriguing underlying concept.
On a side note, I hope they find someone other than Tom Hanks to play Langdon in the movie. He is amazing - but just not what I think of for this character.