I have a strong suspicion that they're going to pattern the Dark Armor and Dark Melee Sets off of the existing Energy Melee and Energy Armor Sets. I think there are a lot of parallels between the two.
Dark Strike (Maybe a renamed Set?)
Shadow Punch --> Barrage
Smite --> Energy Punch
New Overhand Dark Attack to Replace Shadow Maul --> Bonesmasher
Assassin's Maul --> Assassin's Strike
Build Up will replace Soul Drain --> Build Up
Placate will replace Taunt --> Placate
Touch of Fear --> Stun
New Attack replaces Soul Drain slot (maybe Shadow Maul since Spines has a cone attack in this slot) --> Energy Transfer
Midnight Grasp will stay the same --> Total Focus
Dark Aura
Hide --> Replaces Death Shroud
Dark Embrace --> Kinetic Shield
Murky Cloud --> Power Shield
Obsidian Shield --> Entropy Shield
Dark Regen will probably get the boot for a passive RES or DEF power against Neg NRG and maybe PSI --> Energy Protection
Cloak of Fear will probably stay. Despite the fact that it's useless in it's current incarnation, it kinda parallels --> Repulse with it's high end cost and limited use (Take that with a grain of salt since I haven't used Repulse yet, ok?).
Dark Consumption --> Energy Drain.
For some reason, i really think they'll move DC to the armor side. Not only does it parallel EA but it frees a spot in the Melee side for another straightforward attack (which I think it will desperately need).
I think they will nix Oppressive Gloom and replace it with Cloak of Darkness --> Conserve Power. I think they will view stackable Stealth effects as worthy of a lvl 35 power. Don't ask why I think that, it's just the impression I get.
Soul Transfer will not be replaced. It has stuck around with every incarnation of Dark Armor and every released Issue. If they replace Soul Transfer, all one hundred Dark Armor scrappers will simultaneously cancel their accounts in protest. This includes me since I've got four toons with Dark Armor
Anyway. That's my totally useless prediction. $.02