In orbit You would have no gravity, but You have air pressure, this means bubbles would form, more or less, as they do here on stable ground.
Main difference would be bubbles won't try to "rise" because they can't decide what direction is "up" ;)
In truth the liquid (water, Coke, whatever) that won't try to go "down" dislodging the lighter gas.
Since there's no gravity keeping the liquid down it is very unlikely someone is crazy enough to leave a liquid mass "unattended" (carbonation not withstanding).
Left to itself a liquid mass is held together only by surface tension (we ignore gravity pull, which is several orders of magnitude weaker). This is more than enough to hold together droplets, but is easily overcome as mass increases and the spherical drop undergoes larger destabilizing forces.
In an ideal world (absolutely no perturbation) liquid would assume a spherical form to minimize surface.
Carbonation would add bubbles enlarging the sphere, but bubbles would remain static due to liquid viscosity (they are far too large to participate to Brownian movements). If, however, two bubbles would came in contact (come to a distance of a few intermolecular lengths) then the bubbles would fuse together (or release the gas outside the sphere, if near surface).
I repeat: this is not realistic for sizeable masses of liquid as the "no perturbation" clause would be very difficult to maintain.
A sealed can would contain a mixture of liquid and gas not separated by sedimentation due to gravity.
Opening such a can would release (some of) the gas in liquid solution with the net effect of increasing the volume of the mixture, propelling it from the opening (and pushing the can in opposite direction). Highly carbonated liquids would resemble a foam, but would decay due to bubbles being near enough to interact (liquid is in movement).
Anyone doing such an experiment in a real space station would have to clean the mess first and then face consequences.