So some suggestions i have come up with for 5.3 are-
-Reduced RP cost of death coil
-increased necrotic strike damage OR healing absorb
-giving some damage to the last tier of tallents.
-Increased garg damage
-inreased scourge strike damage
-Blood plague/frost fever increased damage by 5%
-Ghoul's damage increase by 3-5%
Those were some quick things I could think of that may help with our dps. I have some more suggestions that will most probably wont happern but it could make UH dk's a bit different from Cataclysm.
-Having a ranged ghoul (so like if you want to be a ranged DK)
-A transformation (like Avatar but for dk's)
-Unholy Presence that drains life (like the old blood presence in WotLK
-having a Death N Decay be like concecration and not having to click on ground to place it it just happerns under your feet.
These are just some ideas tat i thought would be good to have in the future. I want something new blizzard, not the same ol stuff from cata.