Jedi are as they always have been. 

STF: They do not have an apprentice system, as they function as a military outfit. They do, however, act in squads under a ranking officer. Unlike realistic military squads, where the members are interchangeable and are assembled before missions, STF squads are permanent, and are trained to intuit each others actions through the Force, and to act with minimal or no communication. A new member can't just join the squad at any time, they would have to go through the rigorous intuition training again, which is made more difficult for the new member because the rest of the squad have already defined their roles and don't need to communicate.