David McCullough: Intellectual Historian?

It appears that David McCullough will soon produce a work of intellectual history. The book is tentatively titled The Greater Journey: Americans in Paris, 1830-1900 and set to be published by Simon and Schuster in May.

According to AP, the work will be "a history of American artists and intellectuals in Paris." A dead Publishers Weekly link from 2007 at Wikipedia---it's relatively innocuous, so I don't feel uncomfortable relaying it here---reports that McCullough will span "multiple topics and people...touch[ing] on achievements in literature, medicine, art, architecture, music, and dance."

Color me intrigued. I'll be interested to see how much, and in what ways, he engages the subfield's historiography. And I wonder how much philosophy will make it into the book?