Pathfinder Unchained introduces rules for Lore skills, which overlap somewhat with the set of core Knowledge skills. I think Lore skills make a lot more sense, so will be making heavy use of them.

Knowledge (Local) will no longer provide any knowledge about the local area. It's primary purpose will be two fold:

• Knowing about humanoids (humans, elves, goblins, etc). As before, it can be used to determine general weaknesses of opponents. It will also be used to identify humanoid tracks, in conjunction with Survival.
• Streetwise. Dealing with humanoid populations, both overt and covert. It won't tell you where the local thieves guild is, but will tell you where it's likely to be, and where would be best to go to find out. It may be used in conjunction with Diplomacy for gather information checks, or selling stolen loot.