From the link to that article (post above this):
Federal prosecutors now have to decide if they want to seek to retry the case. A status conference is set for Jan. 10.
With one lone holdout, my guess is that they will go for a new trial.
Wonder if someone "got to" that juror, like often happens in cases vs. criminal enterprises (mafia, etc). That's how Mafia chieftain John Gotti walked away from several major federal criminal prosecutions.