Yeah there really wasn't a whole lot of noticeable changes made. Mainly small fixes to issues with quests and such. You will notice though that your settlement structures appear from much farther away since they increased the "Draw Distance".
Preston still doesn't shut up about quests, but I immediately noticed that they fixed which ones he gives you. I use to only get "kidnapping at Abernathy farm", "goul problem at tempis bluff", and "geenskins at Sanctuary". Now he is sending me to all my settlements and having me defend the castle and such.
They said they improved snapping of pieces in workshop mode, but I noticed no difference.
Pretty much the duty label put on settlers is the only noticeable thing that stands out if you haven't read the patch fixes and gone in search of if they changed or not.