The other day, people were kinda bummed that the new Force Awakens ships had arrived from Fantasy Flight Games, but the new Imperial Assault Carrier wasn't available. Well, it would seem that the bigger ship just took a little longer to maneuver into place, as it, too, is now available.
With this release, the Imperials catch up with the Rebels in number of huge ships available. Though while the Rebel's transport ship only really transports Rebels, the Imperial's transport ship transports Imperials and some TIE Fighters for good measure. Use this mobile launch-base to get your TIE Fighters to the action safely and effectively, meanwhile giving them some backing firepower along with it.