I'm so glad that the original Bioshock developer is making this rather than 2K Marin, and I'm also glad that they are taking the game in a completely different direction than the original.
i'm guessing it's gonna have skypirates, it has to... and more awesome weapons and sandbox style, like starting genders, maybe relationships, grafted armor, weapon skills, and different upgrade trees, like for a pistol, you can make it so at the end of the tree its semi-auto and high power or full auto whith medium damage... same for plasmids, start basic, from there you can branch to stream or blasts, and even combine them... lightning and fire for a plasma wave... i also bet theres gonna be weapons that focus plasmids and dual-weilding guns/plasmids like two pistols or two plasmids at once
i don't think you'll get to choose your characters gender since they have already stated that the main character is male, but everything else you said is possible.
the main character is searching or a woman in the city and once you find her she will help you fight and you will be able to combine plasmids with her and stuff, and that makes me think that this game might have co-op.
also rose vine plasmid FTW!
pneumatically launched i guessed, and probably a flight/long-jump plasmid
http://bioshock.wikia.com/wiki/BioShock_Infinite
also the game will also have a completely new graphics engine.