What's new in the Windows 10 Insider Preview build 10158?

Start by ChangeWindows.org

• More apps now use the accent color as their tile color
• The full screen start menu now shows the power and all apps button at the bottom
• The hamburger button no longer shows a notification icon when new apps are installed, this is now shown at the all apps button
• New animations for tiles, including the added-then-removed-now-added-again 3D-animation
• New boot animations for apps
• Most WinRT tiles can now take the large tile size (including Edge, Calculator, etc)
• The smilies for additional icons above power have been replaced with actual indicating icons (and some have been updated)
• Full screen start is now aligned higher, allowing more tiles in the height without a scrollbar appearing
• Search will now show a "Try Cortana" button on the bottom if Cortana isn't activated
• You can now swipe up on the left side of start to show all apps
• Suggested apps can no longer be hidden (or this feature has been removed/disabled totally)

Interface by ChangeWindows.org

• The window chrome of Win32 apps is now the same as for WinRT apps
• The clock, language and other notification-fly-outs have been updated with a transparent background
• The back-button no longer takes the accent color in some apps
• Apps no longer have to take a white icon on the taskbar anymore
• More apps have a tile-less icon on the taskbar
• Multiple icons have been revamped
• All Win32 controls have been given a redesign
• The taskbar animations for loading, needs attention, etc. have been updated
• The installation experience has been updated, it also introduces more apps
• There are new default wallpapers
• Propertie windows have received a visual update
• In tablet mode, icons no longer disappear behind the Task View, Search and Back button when app icons are shown

Features by ChangeWindows.org

• Action center
  • New quick settings for Notes and Quiet hours
• Cortana
  • Cortana now has a refined UI
  • Additional features have been added, like flight tracking, etc.
  • Cortana now supports Office 365 integration
  • Cortana will sometimes "talk" to you through the searchbox
• You can now set a timer in the snapping tool

Edge by ChangeWindows.org

• Project Spartan has been updated from version 15 to 20 and is now called Microsoft Edge
• Edge has new icons
• The feedback icon has been removed from the main bar
• There is a new share icon on the url bar
• You can now enable a dark theme for Edge
• You can now drag and drop tabs between multiple windows
• Improved ECMAScript 6 support (without flags)
• You can now manage your passwords
• You can now change the search provider
• When closing Edge with 2 or more tabs open, it will now warn you
• Pinned hubs now look better
• You can now show a home button
• Pinning sites to start is broken in that it no longer has the site's theme, but a normal Edge logo

Apps by ChangeWindows.org

• Multiple apps have been updated to more recent versions (that already where available for earlier builds)
  • Most stock apps no longer have a background color for their icon in the taskbar
• Store
  • The "Store" apps has been removed, leaving only "Store (beta)"
  • The Store has received a new design with an interface more similar to other apps (back button in titlebar, etc.)
• New "Get Office" app
• New "Phone companion" app
• New "Microsoft Wi-Fi" app
• Photos
  • The photos app now supports GIFs
  • You can now choose to open a picture with another app
• Insider Hub
  • The Insider Hub has to be activated in "Add features"
  • There Insider Hub has a new icon
• Settings
  • There are new animations when switching applets
  • Automatic color picker now works
  • You can now enable features that aren't enabled by default trough Windows Update
  • You can now exit the Windows Insider program