Apparently they're already planning an Advanced Player's Guide with 6 new base classes. Let the publishing whirlwind begin. (Note: This is where your money drains from your wallet like a schooner sucked into Charybdis)
To be honest I don't mind supporting Paizo. They're WoTC's competition and I enjoy their products. They've kept 3.5 up and running so I'm willing to fork over some moolah for that.