I'm not buying this DLC. However, maybe a few people who did can tell us about the banter. Perhaps we can figure out if this DLC is part of the original game and was cut before launch.
Why do you care if the dlc has content made before launch? It seems you have made up your mind about it before even playing it so are you honestly just looking for more excuses to hate on Bioware because "screw dlc".
For your information it doesn't feel like they've postponed the dlc until well after release. The dlc doesn't feel like cut content but closer to additional content so it's not highly integral to the story but it's a nice little addition with a good chunk of lore.
You won't find any new types of enemies as in you have the standard Venatori style archers, warriors, mages, Brutes, rogues but they all have something extra to them as in archers can freeze you into place and brutes can use samson's whirlwind attack etc.
Environments look amazing. They have reused assets from one of the main missions in the game but it's done in such a way it's not really noticeable.
Dialogue doesn't seem reused and you get to know a fair more about Harding. They'll even make comments specific to the progress you have made in the game which is a nice touch.
If you want more details, here's a link to a previous post of mine:
http://forum.bioware...3#entry18861230