This is our first hand-on video of the first Windows 10 for Phones Build 9941.12498 and we have covered UI change like new Tile size, App List, Expandable Action center, Actionable & Expandable notifications and ability to clear single notifications. People Hub shown above in screenshots has both new Tall and big square size tiles to showcase. Read more about the Notification handling in Windows 10 here.
Check the below video for the hands-on demo.