Boba Fett
Han Solo
Leia
Luke
Bossk
Chewbacca
Darth Vader
Emperor
Grievous
Iden
Kylo Ren
Lando
Maul
Phasma
Rey
Yoda

Abilities leaked here: https://www.reddit.com/r/StarWarsBattlefront/comments/6kgkb4/swbf2_unannounced_hero_details_weapons_abilities/

Disappointed in no Mace, Kenobi, Dooku, or Anakin, but they might add them in later addons.