Healers creating AE heal bubbles, and AE healing will quickly become targets. With the advent of player-collision and FF, things will get interesting. Seems like the battles will liekly revolve around the healers, unless ranged plays a large part.

The ratio of toughness/damage , toughness being how hard it is to kill someone, versus the effectivness of ranged will be a huge indicator on how battles will go. We might see an RTS-like effect, of massed range units. Possibly with some meatshield support, and of course healing units interspersed.

In any case territory use and ability to maintain the discipline to move promptly and stay with your group will be paramount to success. I expect it will be an exciting time for the groups and guilds with the wherewithal to field and organize 60+ people.