I didn't go through all the posts, so If I'm treading old ground just tell me to go away.
Did anybody notice that there didn't appear to be a weapon system like in Bioshock 1? It seemed like you discarded whatever gun you were holding for the new weapon. I don't have a problem with it, its obviously more realistic, but it makes me wonder if weapon mods will be back. I quite liked the modification of weapons in the first game.