Burial at Sea (Bioshock Infinite DLC)

 Spoiler

Yeah, I agree, Elizabeth was strangely dark in this one.

I'm fairly sure she is the exact same Elizabeth from Bioshock Infinite's timeline, only older and more wary after travelling through other timelines and universes. I think this because she notices the "Air Grabber" that Booker finds and calls it a skyhook, and then talking about constants and variables. she also has the brooch that you selected for her early in the main campaign (the bird or the cage)

Whether she is or she isn't, i'm certain that the second part will explain her actions, and since we are seeing things from Elizabeth's perspective now, we might get an even bigger view of the Bioshock universe, and possibly more hints as to the next game..

I found part 1 to be pretty fun, but I have much higher expectations for part 2, story and gameplay wise.

Yeah, I'm expecting things to go much deeper. Still, I miss the innocent Elizabeth from Infinite