Windows 10 Technical Preview 3 is out

You can now disable the search and taskview button

The action center has been placed in the notification area

Favorite folders can now be pinned to Home in File Explorer

Animations have been refined

More icons have been replaced with new icons

OneDrive now uses selective sync

New battery indicator

• Touch gestures on a touchpad are now build in and universal across all Windows devices
• Improvements to multi monitor support have been made
• MKV support has been improved
• "System compression" has been added to Disk Cleanup as a new option

• The 3 dots-icon has been replaced with a hamburger menu icon, works the same
• Dialogs in WinRT are now windowed

• A feedback icon has been added next to options prominent in the interface
• Extended standard and API support
  • Support for Content Security Policy
  • GamePad API support is returned
  • CSS Transforms - preserve-3d support
  • JS Arrow function
  • JS iterators
  • JS Symbols
  • Media Queries Level 4: Interaction Media Features
  • Selection API support
  • ES6 Object Literal Enhancements
  • ES6 Promises
  • WAV Audio Support
  • ES6 Built-ins
    • Math
    • Number
    • String
    • Object
    • RegExp
  • ES6 Classes
  • ES6 Spread
  • ES6 Template Strings
• Experimental Features Dashboard
• The User Agent String has been altered
• Edge has been added

• Insider Hub
  • Insider Hub has been added as a new app, news portal for Windows Insiders
• OneDrive
  • OneDrive has been removed as an app
• Search
  • You can now pin the search app to the taskbar and start screen
• PC Settings
  • Storage Sense has been added to the main menu
  • You can now back-up settings to OneDrive (not the same as sync)
• Windows Feedback
  • Feedback can be sorted on trending, number of "Me Too" and most recent
  • The apps will take you back to the category after posting a feedback
  • Bugfixes when searching
  • Screenshot button is now easier to find
• PC Settings
  • Some panels have been updated
  • You can now change your background hrough this app
  • Under "Privacy", Cortana options have been added