Not quite there apparrently - they forgot some stuff, lol:
Content Delivery Network. Basically their servers that hold the AC files. This was posted on the AC launch announcement:
ALERT: We are aware of a widespread issue in which the game locks between the Hangar and Arena Commander. We are working the issue and will publish a patch as quickly as possible.
UPDATE (12:58 PM PST): The cause of the lock up has been identified: several necessary map files were not correctly served to end users via the CDN. The team is working on a solution now!