Some of my very favorite authors:
Rain Gods by James Lee Burke circa July 13. Just watched Electric Mist over the weekend, based on Burke's In the Electric Mist with the Confederate Dead. Hate to say it, but I wasn't crazy about Tommy Lee's portrayal. Best Burke-based movie I've seen starred Alec Baldwin(?) and Eric Roberts. Just my opinion.
The Defector by Daniel Silva on July 20 or so. This one is purportedly a sequel to Moscow Rules and also features Israeli operative/art restorer Gabriel Allon.
Also on July 20 comes Fire and Ice, the newest entry in the Joanna Brady series, the 14th. Rumor has it that it will also involve JA Jance's other sleuth, JP Beaumont.
South of Broad by Pat Conroy sometime in August. Excited about this one, his first in many years. To give you an idea, I once forced the family into vacationing on Daufuskie Island, SC, setting of The Water is Wide, or Conrack in the film version with Jon Voight. The daughter got food poisoning, insists she was cured by a ghostly witchy woman in a nightmare, and has never let me live it down.
Finally, one to keep an eye out for in August is Where Men Win Glory: The Odyssey of Pat Tillman. It's by Jon Krakauer who's written some good stuff. My favorite: Into Thin Air.