Jolee Bindo could be the master of Revan's son. Handmaiden (Brianna), Disciple, BaoDur, Juhani, Visas, Atton and Atris (if you were LS) could form the new jedi council. Someway Bastilla disappeared too while searching for Revan. Mira would be dead like Kreia said, and her death could be related with the begining of K3. Zaalbar and <wookie> could have a fight. Some lesser Mandalorian apearance.
More rich worlds, more side quests, more challenging combats. You could age and start as a padawan and go until a grand master. You could earn more or less experience based on how hard the combat was.