User blog comment:Pedro9basket/Battlefield 3: Back to Karkand Gameplay Trailer released/@comment-2224289-20111104183605/@comment-28584497-20111104183934

The difference is in flag placement. Double assault, for instance, has two flags on opposite sides of the map in the middle of the field, head-on IIRC is the one where one or both sides had a base with a cappable flag, and assault is just normal CQ