03/18/2010 05:12 am ET | Updated May 25, 2011

George Stephanopoulos Thanks "This Week" Viewers (VIDEO)

George Stephanopoulos signed off from ABC's "This Week" Sunday with a special message for viewers about his upcoming departure from the program.

"You may have heard that tomorrow I start at 'Good Morning America,'" he said. "It's going to be a great challenge for me, and I hope you'll tune in there too. My only regret as I head to New York is that I won't be able to continue our Sundays on 'This Week' for very much longer. As all of you know, this has been a special and important forum for discussing politics and public affairs ever since David Brinkley began the program almost thirty years ago. It's been a big part of my life too -- and an honor to anchor these last seven years. I'll continue until a successor is for now, I'll just say thanks for sharing part of this Sunday with us, we'll see you next week."

Sunday evening, Stephanopoulos tweeted the following about his big morning:

Almost bedtime for me. First day on GMA tomorrow -- and David Axelrod my first guest. Lots to discuss after watching Pres on 60

Stephanopoulos will juggle hosting duties at "This Week" with his new job anchoring "Good Morning America" for an interim period before a successor is announced.