Although only three primetime news magazines are airing these days -- 60Minutes and 48 Hours Mystery on CBS and 20/20 on ABC --two of them are almost certain to dominate the ratings this week with big"gets." It was announced Thursday that 60 Minutes had landed thefirst interview with Barack Obama and his wife Michelle since the election.The interview, to be conducted by Steve Kroft, was scheduled to take placetoday (Friday) and to air on Sunday. Meanwhile, Barbara Walters, in one ofher rare appearances on 20/20, the program she once hosted, isscheduled to interview Thomas Beatie, the controversial "pregnant man" whogave birth to a daughter earlier this year and who reveals in the interviewairing tonight that he is pregnant again.