The "Today" show's newest host made his official debut on Monday.Willie Geist, the former host of MSNBC's "Way Too Early" and co-host of "Morning Joe" stepped across the plaza to begin his tenure on "Today."Fellow co-hosts Matt Lauer, Savannah Guthrie, Al Roker and Natalie Morales were on-hand to welcome Geist and present a video package dedicated to the former MSNBC anchor's rise in broadcasting.