This has to be one of my favorite updates. Didn't really affect any of our characters in a negative ways, and then it solved one of the major discussions in our group - how to handle small step down type falls. I totally in love with the new Hop Down option under Acrobatics.
I like the "Hop Down" and the changes to Aid Another (I always wanted it to scale, and the fact that it has a small chance to impose a minor penalty is kind of nice too the more I think about it).