Now, according to Mark Bowman, Braves beat writer for MLB.com, we now know who the Braves sent to Chicago to get Johnson and Maholm:
As— Mark Bowman (@mlbbowman) July 31, 2012
@ken_rosenthal first reported, Arodys Vizcaino will be going to the Cubs with Jaye Chapman
Vizcaino is a Braves top relief prospect but has been plagued with constant problems with his arm. During spring training the 21-year-old right-hander underwent Tommy John surgery. Jay Chapman is a 25-year-old relief pitcher who played for the Gwinnett Braves, Atlanta's Triple-A affiliate.