The average download size of upgrades has been reduced, typically by about one third, due to the OS only downloading the new files each install needs.
Active Hours, the period during which Windows won't automatically restart to install updates, has also been expanded to an 18-hour interval.
For Windows 10 Education, Enterprise and Pro users, monthly quality updates, for example cumulative security fixes, can now be delayed for up to 30 days after their release to a servicing branch, while feature updates, such as the Anniversary or Creators Update, can be put off by up to 365 days.
Home users have fewer options for deferring updates, but are able to hit Snooze to delay the installation. They will also be able to pick a time when an update should be installed.