It's predominantly red (which is unusual for the USMNT), with white and blue stripes at the chest and shoulders.
A lot of people on the Internet don't like it. They think the top looks like a popsicle, specifically a Bomb Pop.
Darren Rovell of ESPN put the photos side-by-side:
Side by side of US World Cup away kit & Firecracker pop pic.twitter.com/2Xi8RBdnoO (via @JeffDLowe)
- darren rovell (@darrenrovell) April 1, 2014
We're kind of into it, though.
It has colors, at least, which the home kit sorely lacks: