My mon calamari companion speaks basic.
Also while adding a new class is not impossible it takes far too much work compared to other games.
-Way too much VO.
-Story areas (green enterances) that don't currently exist.
-2 advanced classes, balance issues.
-New stat, as each stat in the game is linked to each of the classes.
-New items both for early FPs and end game.
-New companions.
There are two possible ideas to bypass these, one is mentioned above, a third advanced class for each basic class but it means 4 new classes which also brings up balance issues.
The second is making heroic classes that seperates the current 8 into 16. They could have similarities just like every couple of ACs have. Also brings up balance issues.