They are off. On the starting line were Meb, Ryan Hall, Abdi, Jared Ward, Sam Chelanga (half marathon relay) plus Leo Manzano, Matt Centrowitz, Robby Andrews (5 mile relay) and you'll have Molly Huddle and Deena running the 2nd half.
I think this is the greatest collection of American talent on the same starting line this year even if they are all in different races.