I'm a huge Night Lords freak. Love them, the ADB books have been a revelation for me. I remember 6 months back there was a rumor of a Night Lords character for the new codex, he was supposed to be some sort of assassin. Haven't heard anything new about it. I don't know what the chances of a Night Lords SC are, but I would say low. The ADB books have done alot to increase the popularity of the NL's but I think out of the 9 traitor legions, they are in the bottom 3 for popularity of people having armies.
I think the big things that will help define our army will be the changes to Raptors. Two types apparently. The rumor says they'll count as daemons so that means Fear and 5++ save. So we're going to have 3/5++ Jump Troops. That has me stoked. I think having super customizable Chosen will help define the army too, especially if they still infiltrate.
I don't see the NL's using a lot of the Daemonic stuff in the book, like the Dragon, or Daemon Engines. So I think us purist NL players will stick to Chosen, Raptors, Assault Marines, Terminators, Sorcerors, Chaos Lords, Daemon Prince and Tanks. Maybe possessed too (The Exalted...). I'm also going to use cultists as cannon fodder, more as human slaves that the NL's have been known to keep around.
I have a full 3000pts of Daemons to ally with my NL's but I feel dirty doing it, like it's not suppose to be that way. They have been known to cause enough bloodshed to attract daemons but I don't think they would willingly fight alongside them.
I hope their is a way to get Stealth into the army, by buying a USR or something. Anyways. How do you think your Legion will be effected by the CSM book if the most recent rumors are accurate?