On 20 September 2013, Queen + Adam Lambert performed at the iHeartRadio Music Festival at the MGM Grand Hotel & Casino in Las Vegas. On 6 March 2014, the band announced on Good Morning America that Queen + Adam Lambert will tour North America in Summer 2014. The band will also tour Australia and New Zealand in August/September 2014. In an interview with Rolling Stone, May and Taylor said that although the tour with Lambert is a limited thing, they are open to him becoming an official member, and cutting new material with him.
On what show did Queen announce they would be touring with Adam Lambert?
Good Morning America