The Notify watchers checkbox remembers your choice on a per-page basis. If you've chosen not to notify watchers on a particular page, it'll be unchecked next time you edit that page again.
When you copy content from the editor and paste it into another page we'll re-attach any images for you, automatically. You'll be seeing a lot less of the dreaded "unknown attachment" error.
To save time when creating blank pages, we're taking the process from 3 steps down to 1 with our new 'quick create' option. Instead of a single create button in the header, you'll now see two options: Create (blank page) and Create from template.
The Save for later option (previously called Favorite) has been moved out of the menu and right next to the Edit button, making it faster and easier to mark something as a favorite.