It's already out here in Germany. I got my copy on saturday. While I haven't had a chance to go through it very closely, what I've seen so far is decent. The prestige class section is mostly good, as are the regional feats. I like the appendices, with the exalted/vile and psionic tie-ins. Though i'm not crazy about the artwork...some good stuff, some bad stuff, mostly just average.
The balance changes are good, as far as I can see. The incantatrix is fixed, as is persistant spell. I'm at work and don't have the book with me, so I can't think of anything else off hand.