It seems they are incorporating some of the 'new' canon as well, the Purge Troopers and Second Sister were introduced in the recent Vader comics. And since the Clone Wars and Rebels shows are also in that canon, there are a few other Jedi alive like Ahsoka Tano, Kanan Jarrus, and Quinlan Vas so as a betting man I'm assuming they could make appearances in this game (and also Yoda and Obi-Wan, besides those there is also Coleman Kcaj
, Oppo Rancisis
, Master Uvell, Selrahc Eluos (mentioned in Vader comics), Ka-Moon Kholi.
I've been waiting a full decade for more single player SW games, and Respawn definitely has some developers with pedigree behind this title. Also as was mentioned below there some aspects of the SP Battlefront 2 that were good. The cutscenes and dialogue with Luke Skywalker alone were basically peak Luke, mimicing how he was in the Thrawn Trilogy, the one I would have rather seen TFA and TLJ.