First of all, know that Mutilated is the name of the trailer, and not the name of the TDA’s second part (wish is currently untitled). For the moment, I’m thinking about Spring (ending) or Summer (beginning) seasons of 2015 for the release of this first part, but for the moment, nothing is sure. For the second part: I don’t know.
The story-line won’t be changed, excepted… at the end of the first part, I’m planning multiple deaths for different major characters of the Wolfenstein series ─ respecting the story-line of every Wolfenstein games, including The New Order.
The story-line of the second part is kept secret, I won’t spoil the big surprise of the first part’s ending.
The Dark Army: Uprising will have five levels, and The Dark Army: Part 2 (Untitled ─ it’s not Mutilated, wish is the title of the trailer as I previously said) will also have five levels, respecting then the different promises I made when I first presented The Dark Army back in July 2013.
You don’t know? TDA will have multiple new features compared to the original game - it’s not a simple add-on! There will be new guns (and remade guns), new HQ sounds, new HD textures, new skins and a lot more ─ I just can’t say how much new things there will be. It’s a MOD.
Of course this mod is going to have multiple secret areas - about two per level, with different equipment resources, treasures and more.
I hope these answers were useful! See ya’.