Infinite's answer to Plasmids and Gene Tonics are Vigors and Nostrum, maintaining the offensive/defensive combat system that Bioshock 1&2 created.
I made this thread so people could input what Vigors or Nostrums they would like to see in Bioshock Infinite. Here are the already confirmed Vigours:
Murder of Crows Vigor:
These send out a swarm of birds to attack your enemies. The obvious influence here is the Insect Swarm Plasmid - I'm guessing the crows will crowd around an enemy or group of enemies and peck them, enabling you to shoot at your own leisure.
This seems to be another updated version of a previous Plasmid (Electro Bold). I'm guessing there will be some sort of upgrade system involved here, and we already know that Elizabeth can send out a raincloud to allow you to electrocute many enemies at once.
Confirmed, was also in the previous games (I'm surprsised that the three Vigours we saw were all akin to Plasmids in the previous games). I'm sure you'll be able to do new things with it, though. Elizabeth was able to bring up objects from her surroundings and bring them together into one big explosive metal ball - and hand it to DeWitt who was able to throw it with his telekinesis.
What are your ideas?
Concussive Blast Vigour:
Sends out powerful sound waves, knocking enemies off their feet. Has obvious implications in a city where a wrong move can send you plummiting down thousands of feet.