In the Beta PF, we had a side note which said that sneak attack was possible against almost all creatures, expending from what D&D3.5 permitted.
Yet, in the new Core Rule book, I did not see such a mention... Has Sneak Attack reverted back to what it was in D&D3.5?
The previews of the besriary show us that there isn't a differnce between beta and final. I believe that sidebar was more for informational purposes for people switching to PFRPG from 3.5. As it's own ruleset they probably deemed the sidebar unessecary.
I didn't see it covered in the Core Rulebook, but the conversion guide states:
Note that the rogue sneak attack ability now functions against most constructs, plants, and undead. It doesnot function against oozes, elementals, and incorporeal undead.