The Pittsburgh Pirates activated both lefty reliever Wade LeBlanc and right-handed reliever Joaquin Benoit from the disabled list today on the first day of expanded rosters. As mentioned here earlier this morning, they aren't expected to call up anyone from Indianapolis today.
Some of the September additions will just come from players like Francisco Cervelli, Adam Frazier and George Kontos coming off the disabled list, while it appears that they are letting the players in Indianapolis stay with the team through the playoffs. Edgar Santana could be the lone exception, but he isn't eligible to be added to the active roster until tomorrow.