Call Out Your Cursor, that shake to make bigger thing, is much harder to activate now.
SIMBL, which I installed under DB3 by temporarily disabling SIP, is still working after this update.
The Finder side-bar still shrinks each time.
I had an issue with Calendar sometimes not showing the right alarm times after edits (I link it to Google calendar not the iCloud one) which has been resolved.
Spotlight correctly opens where I last left it (in DB3 it started opening at the bottom of the screen each time).
My recent FaceTime caller list has been wiped, so I'm wondering if some work has been done in that area.
Contacts is grabbing email addresses from mail messages where the name matches one in contacts. There's a (i) next to each one and clicking gives me the option to keep or remove. There's an option in settings to turn this feature off. I think this is new; at least I never noticed it before.