It's not in the beta right now as evident from the videos at http://www.curse.fr/warhammer-online/videos/

Multiboxing, as long as you stay alive or you're not knocked out of the way, you can block enemy players


Further thoughts from what I've seen of WAR in videos:

Bright Wizard, best possible multi-target and single target DPS, AE damage (ranged) looks better for a Zealot. As for healers, goblin shaman have a strong AE heal, two shamans kept a team alive while they were attacked by four Bright Wizards.