According to NBC, production of the show will move to New York for season #7.
“Howard Stern’s larger-than-life personality will bring a thrilling new dynamic to America’s Got Talent starting this summer,” stated Paul Telegdy, President, Alternative and Late Night Programming, NBC in the press release. “He’s a proven innovator and his track record in broadcasting is truly remarkable. Howard is very passionate about this show and is fully committed to its future success.”
Source: NBC – December 15, 2011