"When MoP rolls out - melee, spell, and ranged attacks will all have the same chance to Hit, Dodge, and Parry. So on the first chart, the green and blue lines will be the same as the orange (although it will move a bit)...hence the Hunter nerf."
Expertise will give spell hit for casters.
However spells cannot be dogd'd+parried, only missed/LoS'd
I am glad for the hunter nerf(i main agl/str classes, and you gain (27%??) agl/str as dodge/parry) i may e wrong on this, but you DO gain Ddg,pry from STR/agl