There will be plenty of classical music, to be sure. The Boston Brass are there--and by the way, they'll be presenting a patriotic concert on July 4. Benjamin Wallfisch is at the festival to lead the Festival Symphony Orchestra. He'll be presenting a talk, "Everything you Wanted to Know About Tchaikovsky but Were Afraid to Ask" on the 7th, and will lead the orchestra in a Russian program on July 10. Guest pianist Alexander Schimpf will solo with the orchestra. There's also a track called "Opera in Paradise", with 14 performances, master classes, free talks and more.
In addition to the classical music, though, there are two other tracks: Bluegrass in Paradise, and Gypsy Jazz in Paradise. Both will feature prominent performers, and this should provide an interesting contrast to the straight classical music (which I highly favor, of course--but I'm not averse to a little variety on occasion).
Should music festivals be more diverse, or should they focus primarily on one genre? I'm open to comments.