From videos I've watched, these are all the pokemon seen the in trailer:
Kanto: Ekans, Arbok, Pikachu, Raichu, Bellsprout, Weepinbell, Victrbell, Onyx, Stryu, Starmie, Magikarp, Garaydos, Pinsir, Eevee, Flareon, Vaporeon, Jolteon, Aerodactyl, Dratini, Dragonair, and Dragonite.
Johto: Pichu...