IDW Editor Denton Tipton has updated his blog with a slideshow featuring what was shown at the IDW panel at SDCC, as well estimated in-store August release dates:

• August 13
  Reign of Starscream #4
  Animated: The Arrival #1
  Best of U.K.: Time Wars #1
• August 20
  All Hail Megatron #2
  Spotlight: Doubledealer
• August 27
  Reign of Starscream #5
  Animated Series Vol. 4
• September 3
  Saga of the Allspark #3
  Best of U.K.: Time Wars #2

Keep in mind that release dates are estimated in-store dates, and can change.