I am thinking which gear would be the ideal for the expansion..Most of us will be full epic when the expansion come..and we probably would keep this gear until lvl 74 or 75..So raid gear focus on AP or PvP gear focus on stamina..Both would have some disanvantages..
With raid gear you will have many intel.., mana per second and Hit rating which i believe would be total useless in quests.(you can **** and drink,and most of the time you will fight mobs same lvl with you or at least 1 lvl more)
With pvp you will have resiliance whici is total uselless in pve..
From my experience in BC expansion i am thinking that stamina would be the most important thing for us to level fast!