I plan to dualbox an enhancement shaman (melee, main) and a druid (caster/healer). So far I'm still testing if it's viable. How I think I'll be using it in PvP is keeping druid in stealth while shaman goes into melee. When he needs healing I'll unstealth the druid (he's parked somewhere behind a tree) and start casting heals, and at some point start dps'ing/rooting/cycloning when needed. Will it be easy? No. Cool? I should think so

Trade the shaman for a rogue and you have a dual stealth team which will come in handy in PvP, especially AV.