The official relays have been announced for tonight's finals session, and no surprise: Allison Schmitt will anchor the American women as they shoot for gold. Their relay will be Missy Franklin, Rebecca Soni, Dana Vollmer, and Allison Schmitt.
There was also no surprise on the American men's relay, that will be Matt Grevers, Brendan Hansen, Michael Phelps, and Nathan Adrian: a group that includes three individual champions in their respective strokes.
Among notable decision in other relays: the British women will run Gemma Spofforth, Siobhan-Marie O'Connor, Ellen Gandy, and Fran Halsall. There were a few possible moving parts there. The British men, however, had a bit of a surprise: even after a great prelims swim, where they placed 2nd overall behind the Americans, they've still decided to put in Michael Jamieson for Craig Benson in this final.
And finally, the German men will anchor with Markus Deibler to replace Marco di Carli, who finally had a good swim with an anchor of the prelims medley.