This has nothing to do with their APs. This is about expanding and taking money that is very likely there to be taken.
I don't buy that 4e doesn't allow them to tell the stories they want. It's an acceptable public excuse and nothing more. Companies that leave money on the table generally don't do well in the long term. Paizo is a lot smarter than that. My prediction holds.
Which requires the GSL, which they dont particularly like. As the SRD doesnt allow them nearly the same freedom to create stories and classes and other items they want.
They dont like 4e's method and rules. It doesnt allow them the same freedoms.
Care to make the gentleman's wager on that prediction? Because I doubt paizo is going to do their AP's, their world, and their adventures for 4e.
They might allow others to partner and run with it in 4e, most notiable perhaps Necromancer. But I'm certain that Paizo itself isnt jumping into the 4e pool.