The email blast that just went out today from FIRST says:
We strongly encourage you to complete this registration in advance of your arrival in order to expedite your team’s badge collection. New this year, kiosks will be available in the America’s Center to allow you to pick up your team’s badges “on demand”.
It includes a link to the attendee registration page. I'm already registered as a volunteer, and I received a bar code to have scanned when I get there so my badge can be appropriately printed.