Seems very cool and quite powerful. I would be careful with the 2 flexible feats, I'm sure many will find ways to abuse them by taking some kind of feat combo, do something like crafting items and change them back. The second thing I have to nitpick are the class skills. You get Able Learner for free, but its not helping much unless you multiclass, and I love classes that don't have to multiclass. I would suggest that you get an extra skills as class skill every second level or something like that.
Also, the absolute win about the class are the added martial maneuvers, they really make the combat aptitude good. Arcane Spells + Martial Maneuvers? You've just killed Jade Phoenix Mage... big time.

Also, at last, I would really love to try it out in game.