For PvP i'm kind of split minded i know i do not like open pvp random pking it's lame for all parties involved. although removing bosses from pve channel and only available in a pvp channel would be ok for me.
queued/instanced i think would be nice for some variety maybe bosses that drop rare gear but is faction and or guild based for teams. I'm not crazy about arena pvp in general though i like large scale over 3v3 6v6 etc.
So in my mind you could have the 3 reumons maybe 2 of the instanced pvp battles with the reward of rare drops, and a castle seige daily. Also some little skirmishes for bosses in a possible pvp channel, but right now the bosses only drop vouchers and occasionaly blue gears. It would be nice to see elite bosses that drop epic or better maybe even lvl 3 runes or something in the instanced pvp.