I recently spent a half hour on the phone talking to Foxnews.com about Brown's next book (being considered an 'expert' and all!), although in the resulting story on their website all of my explaining was reduced to one rather bland sentence. In any case, if you want to learn more about The Solomon Key (or whatever it's title will be), then there are plenty of essays here on The Cryptex which will fill you in. Try these:

• - "Solomon Key Hints - From Dan Brown Himself"
• - "The Masonic Foundations of America"
• - "Dan Brown and the Ku Klux Klan"
• - "Dan Brown and the Udjat"
• - Also see the full free chapter from my book which looks at the esoteric architecture of Washington, D.C.

Your best bet though is just to purchase a copy of the book (Amazon US), which has all of the above plus much more.