The days of WOTLK are ending, and so is doing the "hero" status for us. During WOTLK, there has not been another class in the game that could put 71 talent points into a shaker and wherever they ended there would be a viable tank/dps spec (exagerating obviously, but you all get my point). In extend, our class has been a mix of every succesful mechanic from all the other classes which has make us "special" from a design perspective.
Now cata is coming, and that means we are gonna be normalized as any other hybrid class. We will have a tanking focused tree, and 2 DPS trees, the frost one focused on DW-physical-dmg-tree, and the unholy one being a mix of physical/magic. Maybe for the unholy tree, they move the gargoyle from the 51 point talent to an early tier like it was some patches back and they add a new 51 talent like "Sacrifices your ghoul and you gain 10% increased damage for X secs" or maybe they move the master of ghouls talent (or whatever it becomes in cata) to the 51 point talent as "You take a shard of your soul and rise a ghoul that will fight for you bla bla, but the time the ghoul is up you deal 10% less damage with your attacks, spells, and abilities".
Anyway all this is meaningless speculation within 24 hours of a "precap" of the new DK design