Shonda interview mentions Erica/Callie.
Shonda gave an interview with USA Today that briefly touches on the controversy:
She seems surprised more than anything at this season's on-screen controversies: Izzie's hallucinations of Denny (Jeffrey Dean Morgan), including having sex with him, and the departure of Dr. Erica Hahn (Brooke Smith), love interest of orthopedic surgeon Callie Torres (Sara Ramirez)....
Of Hahn, whose departure raised speculation about possible network discomfort with a lesbian relationship: "We didn't have a controversy with Dr. Hahn. The press created a whole thing that had nothing to do with reality."
She disagrees with those who say the departure was abrupt and says chemistry, not sexual orientation, was the reason.
source: USAToday.com
She seems surprised more than anything at this season's on-screen controversies: Izzie's hallucinations of Denny (Jeffrey Dean Morgan), including having sex with him, and the departure of Dr. Erica Hahn (Brooke Smith), love interest of orthopedic surgeon Callie Torres (Sara Ramirez)....
Of Hahn, whose departure raised speculation about possible network discomfort with a lesbian relationship: "We didn't have a controversy with Dr. Hahn. The press created a whole thing that had nothing to do with reality."
She disagrees with those who say the departure was abrupt and says chemistry, not sexual orientation, was the reason.
source: USAToday.com