It's going to vary widely from LEO to LEO. Personally, I'll probably take a moment to assess the OC'er before approaching. Then I'll ask how they're doing before getting down to business. I'd appreciate the OC'er keeping their hands away from the gun and mirroring my calm demeanor. At some point I'll mention the OC and ask them if they have a permit. If they've been friendly and state that they do, absent any signs of deception, I may wish them a good day and move on without inspecting the permit.
If I get any signal that makes me uneasy or suspect they're not carrying legally, I'll ask to see the permit and we'll go from there. If they do anything that makes me feel threatened, it will become a Terry Stop. Keep in mind that a Terry Stop may be more broadly interpreted by the courts than most citizens are aware of. For instance, a traffic stop has been viewed as essentially the same as a Terry Stop. Once that contact is complete, absent any probable cause discovered during the Terry Stop, the contact will be concluded. I'll probably recommend to the person who caused the contact to morph into a Terry Stop, an alternative way to handle future contacts to avoid being hassled needlessly and to save other LEO's some stress and unnecessary investigation.
If probable cause is discovered during the stop, depending on the circumstances, a citation will be issued or an arrest made. Hopefully that will never happen. I'm sure that CLEET will notify all agencies of the pending change. The larger and more progressive agencies will conduct training. All agencies should amend their SOP's for OC contacts. So long as it's not deemed "LES" or "FOUO", I'll post up how my agency expects these contacts to be handled when the changes are issued. Keep in mind that no decent policy is going to mandate a rigid procedure. It's expected that the officer's field experience drive their handling of each contact on a case by case basis. That will ensure the safety of the public and the officer more effectively than a rigid policy.