Per @LynnRutherford, the men's world team has been announced as Ryan Bradley, Richard Dornbush and Ross Miner. The Four Continents and junior teams will be named later.
The other teams can be found in this release from US Figure Skating.
UPDATE: The Four Continents team will consist of consolation prize winners, Jeremy Abbott, Adam Rippon, and Armin Mahbanoozadeh. Interesting that they went that way...in the other disciplines, the world team will also be going to Four Continents. I would think it would PARTICULARLY behoove the US to have the three men we are sending to worlds get another international competition in before the main event, but I guess for whatever reason they are going in a different direction. Maybe all three medalists turned down 4CC? Weird choice.