As we level up, we get more powerful but not OP spells. A charm for Ice of all schools that triples the damage of your next hit is incredibly OP. Can you imagine fighting that in PvP, someone who triples their damage output with just one spell? Storm's Supercharge spell only goes up to 140%, and that's with a full rack of pips.
It's nice to speculate about which new spells we may quest for in the new arc I'm fairly certain that Shadow Magic will be the main focus simply because our new titles say things like "Child Of Light and Shadow" as well as "Journeyman Shadowmancer" There is one character in Krysallis that does tell us we have barely sratchted the surface of Shadow Magic. I'm not suggesting that new School spells won't be available but I don't think they'll be as powerful as some are hoping. I also believe any new pets will either be based on Krysallis characters (e.g Burrowers, Mantis etc) or even more exciting, we may get Shadow Pets with Shadow Magic Talents. I do like your ideas, you've put a lot of thought into them