Completing the previous Saga will correct the current Scroll you're working on. While talking to Trunks, you'll finally meet the Supreme Kai of Time. After the conversation with them, you're free again to do what you want.
Single Lobby is now enabled. Other player's custom characters will appear in the city as NPCs. You'll know them immediately since their names are colored Yellow. You can pay these pseudo-NPCs with Zenis to recruit them to your team on your next PQ. You can only recruit if you're the team leader. Also, if you happen to find a Patroller that you want, you can tag it as Favorite so you can summon/recruit them anytime in the future.
Multi-lobby is also enabled. This is where you can communicate with other online players, form teams, battle against them, and do PQs together. Take note that all online features of the game requires a Playstation Plus membership. If you don't have a PS+ subscription, only offline features are available to you.
Ziko, the old guy outside the gate leading to Time Nest will also give you an Energy Capsule for your commendable efforts.
Other additional changes after completing the last saga: