Don Francisco , the veteran talk-show host who dazzled millions of Spanish-speaking viewers with his Saturday-night program “Sábado Gigante” on Univision , will return to the network. The host, whose program was canceled in 2015 after a run of more than half a century, will host a new limited-run interview series featuring “major personalities from the Hispanic world,” the network said Tuesday during a presentation to advertisers as part of the industry’s annual “upfront” market. The format is expected to feature intimate, close conversations that will be heighted because Francisco’s program is not a regular part of the Univision schedule. The show represents a homecoming of sorts, and would be the equivalent of NBC tapping Johnny Carson to host one-one-one conversations with notables following the end of his tenure on “The Tonight Show:” in 1992. Popular on Variety Francisco, whose real name is Mario Kreutzberger, has not been a regular part of the Univision schedule since “Sábado Gigante” ended in 2015.…