Start and Action center

• You can now show either 3 or 4 medium tiles per group
• The letters in the app list now take less space when "Show more tiles" is enabled
• Tiles now can have jumplists
• The context menus for tiles have been reorganized and provide quick links to share and review apps
• Desktop app tiles now can have their own color
• Start now supports up to 2048 tiles (up from 512)
• The start context menus have been updated to display icons and contain the app's jumplist

Cortana and search

• Cortana now works on local accounts
• Cortana can now understand your inked notes
• Cortana can now track your movies and ticketed events
• Cortana can now warn you for missed phone calls
• Cortana can now save energy when you're away

Desktop

• Task View now allows to snap apps to the screen or replace apps
• When you snap a window and select another window to snap beside it, you can resize both windows at once (only horizontal)

User Interface

• When colors for start, taskbar and Action center are enabled, title bars will now also be affected
• Context menus now have a more consistent design
• Improved dark and light theming
• The look for dropdowns has been changed system wide
• Windows Apps now have an opening and closing animation
• Jumplists have a new design
• Some icons have been replaced (including the Registry Editor)
• The title bar of WinRT apps will now take the color of the splash screen while starting
• The text that is shown while preparing your account has been updated

Microsoft Edge

• Edge has been updated from version 20.10240 to version 25.10586 with the following updates
  • You can now open proxy settings from within the Microsoft Edge settings
  • Edge has a new First start-home page
  • You can now share media to other screens
  • When a page is properly paginated, the next button will light up to go to the next page
  • Tabs won't resize when you're closing tabs until your mouse leaves the tab bar
  • Edge now shows previews of tabs
  • You can now sync your favorites and reading list
  • Middle-clicking the Edge-icon will now launch a new window
  • The F12 tools can now be docked into the window
  • The search engine setting now has its own pane
  • The note feature has a new icon
  • You can now use "Ask Cortana" when reading a PDF
• EdgeHTML has been updated from version 12.10240 to version 12.10586 with the following updates
  • Base for Object RTC support
  • Improved support for ECMAScript 6.0 and 7.0
  • Extended support for HTML5 and CSS3
  • Support for new input types
  • Support for Pointer Lock
  • Support for Canvas blending modes
  • Support for the download-attribute in an anchor
  • Support for the picture-element
  • Support for :in-range, :out-of-range, :read-only and :read-write
  • Support for font-size-adjust
  • Support for input type=datetime-local
  • Support for ellipses
  • Support for Object RTC
  • Support for HTML Templates
  • Support for CSS initial and unset
• The following flags have been added
  • The experimental Javascript functions option is now functional

Settings

• New panels, settings and options
  • Colors for start, the taskbar and Action center now also apply to title bars
  • Windows Spotlight can now be set as the lock screen for Pro users
  • You can now disable the background for the logon screen
  • You can now (dis)allow apps to access your call history
  • You can now (dis)allow apps to access and send emails
  • You can now make Windows select the correct time zone automatically
  • You can now choose to shuffel backgrounds when using a slideshow
  • You can let Windows notify you when there are issues with any USB-connected device
  • The Insider settings now show your account details and allow you to stop receiving builds for a limited amount of days
  • The Control Panel's Theme Settings have been extended, back to the state from Windows 8.1
  • There is a new system in place to warn you for common issues when using the Insider Preview
  • Installing apps to another drive has been enabled again
  • You can now change where Windows stores offline maps
  • Changing the scalling settings will now go in effect when changed, without clicking "Apply"
  • You can now locate your device with GPS and location tracking in "Find my device"
  • The Activation-screen no longer shows a product ID and key but the status if you've been digitally entitled
  • The default apps are now marked as "Recommended for Windows 10" on the Default apps page
  • There is a new "Learn more" link in Windows Update that is supposed to give you info on the latest updates
• Visual updates and others
  • The Settings-icon on the taskbar no longer has a background color
  • The Settings-tile is now transparent for non-fresh installs too
  • The "Storage" tab now has icons for each file format
  • The settings app splash screen now uses the user's accent color
  • The About page now shows the Windows 10 logo in the user's accent color
  • The Windows Insider Ring now has to be set with a slider instead of a dropdown

System

• Improved memory management
• Your default printer is now the last printer you've used
• You can now activate Windows 10 with a Windows 7, 8 or 8.1 key
• The build number of a public build no longer has to be dividable by 16
• WebM and VP9 support has been removed (will return in a later build)
• Improvements to localization text UI in various languages

Apps

• You can now share feedback more easily from Windows Feedback
• Windows Apps can now have jumplists
• Skype Video has been added as a default app
• Messaging has been added as a default app
• Phone has been added as a default app
• Sway has been added as a default app

Other features

• Improvements to the text input panel, including expanding when more space is required and punctuation improvements
• New emojis have been added
• The "Environmental Variables" window has been reworked
• You can now use Hyper-V within another Hyper-V guest machine
• Improved performance for running Hyper-V machines within each other

And further

• Windows will now claim to be version 1511, which stands for its November 2015 release date
• The copyright has been changed to 2016