Bill Bumpus should be expecting ex-wife Gayle King’s sizzling Sports Illustrated issue in the mail. The 69-year-old CBS Mornings anchor is one of the stars to grace the sought-after cover of the legendary magazine’s 60th anniversary of its swimsuit issue. King rocked a sexy one-piece for her debut cover. Models Kate Upton, Chrissy Teigen, and Hunter McGrady also nabbed their own covers for the special edition. “It has sunk in, but it’s still mind-blowing to me, honestly,” King gushed to Entertainment Tonight at the magazine’s New York City launch party Thursday. “I used to look at it all the t…