There is, of course, going to be a ton of stuff in this book that is not new classes. These being the most complex rules features in the book, they are the focus for the playtest. But Occult Adventures is also going to include a bunch of archetypes for existing classes, new feats new things to do with ki, rules for possessions, genius loci, and other similar themes, as well as less-rulesy sections on the Ethereal and Astral Planes (and associated demiplanes), running an occult campaign, etc.
I was just thinking the other day, what Pathfinder really needs, is more classes.
Paizo needs to make money. New product does that without upsetting those who play the game as it already is.This seems like a good example of the disconnect between how off-line gaming culture (huge) is much different than the small but vocal online culture. On-line, I see much clamoring for less bloat, fixing high-level play, and more support for "basic" PF (Beginner Box), but Paizo keeps pumping out the splats. These must be selling good, otherwise I can't see Paizo continuing to print them.
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Paizo needs to make money. New product does that without upsetting those who play the game as it already is.
"Fixing" alleged problems is much more challenging and, in my opinion, much more financially risky. It's more work for potentially less profit.
I don't think anyone has come up with a "solution" to high level play that pleases the majority yet. The "Mythic" rules were certainly innovative, but not really intended as a fix.