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This recent news item suggests that the title of DB's next book will *not* be The Solomon Key. The news is based on a discussion a (different) journalist had with Brown's representative:
During a conversation about the book, which the journalist repeatedly called “The Solomon Key,” Brown’s rep seemed to get exasperated and stopped her:
“You are using a title that was used several years ago. That is completely out of date.”
I'd imagine this was the same journalist that called me about Dan Brown's next book a couple of weeks ago. She told me the same thing, although not in that detail, and asked me for my thoughts. I agreed that it could well be the case, given that much of DB's 'thunder' has been stolen in recent years (not least by myself!), and also given similar news items a couple of years ago.
However, I also noted that some things still argue in favour of 'The Solomon Key' as being the title. A couple of years ago - after the first news of the title change - DB's Solomon Key domains were renewed through to 2016. Also, there have been no new trademark applications in Brown's name since The Solomon Key was registered - and it was renewed most recently in December 2008 by his lawyers, suggesting the title is still well and truly in the frame and not "out of date" as his rep stated (although this is the last 6-month extension available to him for that trademark - so we might know for sure in June).
It's worth noting also that the rep dismissed the ET story as well (regarding Ron Howard's comment that the next book was finished) "repeating that Brown had not finished the book." Not sure that Howard would get that fact wrong, given he's in direct communication with DB. So I'd reserve plenty of skepticism for the rep's statements. Hopefully we'll find out either way pretty soon.