I doubt seriously anything else will even be done in this case. I suspect that there will be a long drawn out investigation where the officers will face minimal discipline and be back on the job. They probably won't even lose any pay. I hope I'm wrong, but we see this over and over so at this point I expect not to be wrong.
My bet is that worst case scenario, he will resign from SLC and be hired by a smaller agency somewhere else. Sadly, there are plenty of areas in the country where people are not pro police, but rather police worshipers. They are quite happy to live under "If you do nothing wrong (and do everything the police say, without question, because they are always right, even when they're wrong), you have nothing to worry about". I seem to recall a few cops that we've brought up here over the years regarding extremely abusive behavior, ended up being hired at some small town force somewhere.
Also, I may be in the minority here, but I think (given that the facts as known are accurate), that the Lieutenant that issued him the order to arrest should actually be equally, if not more liable, than the arresting officer. This is one area where I'd like to see a bit of "militarization" of police: Cop on the street screws up, his boss (aka CO) gets the boot too.
I lean pro police, but man, it gets really hard to defend that view when bad cops are not punished for their actions, and any cops who break the law are not punished to an equal extent of none LE. As much as I hate a surveillance society, I once again plead for 100% enforcement of body cams for all cops.