Yep, based on what was stated in the bullet points in the OP, if you already own the Advanced edition of the Player's tomes you already have most of what will be in the new Player's tome. Changes to 4 classes, a new B/X appendix and some rules fixes will be the difference. The new optional rules read like they'll probably be in the new Referee's tome.
While I stated up thread I likely won't update since I already own the Advanced tomes, I'm liking what I reading. Were I to start running Adv OSE around an IRL table again, I could see myself buying the new Player's tome. I don't know how the new edition is going to effect the OSE content I own for VTT.