There have been no statements indicating a new edition. When they sell down their print run, they'll do another printing that will reflect a new set of errata.
There have been a few errata that have been substantive, but most have been typo and formatting. Bestiaries have tended to have some numerical fixes. You can see what they have been in the past on the product pages for the individual items to see what I mean.
I also highly doubt there will be a major change within the next year or two. They have plotted out the RPG line a while in advance and the next product is Pathfinder Unchained, which is where they would put the kinds of substantive changes you're talking about as optional rules. None of my musings are official, though, as I'm just a somewhat attentive observer.
