As of right now the candidates who will be participating in each debate is exactly the same as the Fox News debate with the exception of Jim Gilmore. As of right now Jeb Bush, Ben Carson, Chris Christie, Ted Cruz, Mike Huckabee, John Kasich, Rand Paul, Marco Rubio, Donald Trump, and Scott Walker will all be in the prime time GOP debate. In the other debate, Carly Fiorina, Lindsey Graham, Bobby Jindal, George Pataki, Rick Perry, and Rick Santorum will all be participating. Of course the candidates who participate in each debate can change because CNN will be using the average of polls from July 16 - September 10. From now until September 10, some candidates may rise up and some may fall and loose their position in the prime time debate. One example of this is many believe Carly Fiorina will make it into the prime time debate because of her strong performance in the Fox News debate and recent polling shows her gaining ground.
You can read more about this on Politico.