On June 22, Fox Broadcasting Co. will debut a 7 p.m. newscast at its New York station, WNYW-TV. The locally produced half-hour show is the first news show to be produced by the fledging network. The network will expand its local newsmagazine show, "A Current Affair," anchored by Maury Povich, to six of its seven owned stations around the country. The show, a combination of "tragic, offbeat and human stories," will expand Aug. 3 to Chicago, Dallas, Washington and Los Angeles, Povich said. It will air locally on KTTV Channel 11 at 8:30 p.m. Povich, who is married to NBC correspondent Connie Chung, has been a local news anchor and talk-show host in Washington, Los Angeles, San Francisco and Chicago.