Degri the next generation season 10 cast who will and who won't be returning?

So, it's official degri the next generation season 10 will be beginning in just a few very short months from now. and I know this year they're trying a new format they're going to air 45 new episode with I think 3 or 4 new shows a week premeiring on muchmusic not ctv anymore. also I heard snake will be becoming the principal! since melissa dimarco (ms hatizlakos) will be leaving the show again and that judy jiao (leia) will be leaving the show after the first half of the season . so I would to know exactly who ALL will be returning to the show for season 10 and who will not ? and will any previous cast members be returning to degri in season 10