when will next seasons schedule be available?

Probably not until mid-summer would be my guess. At least not until the playoffs are all over.

I happened to run into someone from the front office last week and the person mentioned the schedule would be completed sometime in May. They are going to do more Sunday afternoon games and maybe only a few Friday night ones.

OHL teams do not usually release a schedule till after the draft usually the same week and some teams wait longer till they find out what time all their games will be played.