When @-ing people you can now search by name
Activity renamed to Notifications and icons for Mentions & Notifications have been changed (can change this in Navigation settings)
Show verified toggle is now off by default (advanced -> other)
New notification type (replies to retweets)
Added friction to swipe to close
QR codes are now at the bottom of the nav menu
Adaptive icons for shortcuts
Tweeting from multiple accounts at once has been removed due to new Twitter guidelines