Now I know that the good folks at Paizo hasn't shown us them yet but I think it would be a good idea if they did. Right now we all have been looking at the classes with out the new feat but I am sure that plenty of the new feats enhance specifically these new core classes.
Curse Feats for the witch, torture feats for the inquisitioner, prophetic feats for the oracle and and well summoning feats for the summoner.
Let's take the summoner into question. Everyone keeps saying that a Druid is still a better summoner but IMO this is largely due because there are a lot of 3.5 feats out there that enhance the nature's ally spells selection. Personally I would like to see that happen with the summoner.
So I think we are missing a key component here in testing out the classes with the new feats designed to go with them, unless they don't exist at all. However, I find it hard to believe that a APG would come out with new core classes that didn't have new feats that would go hand in hand with them.