Here are a few of the other features you will see;
- A Start hint that appears on the taskbar, where the Windows 7 Start button is located
- More flexible Start screen customization options
- The option to go directly to the desktop instead of the Start screen
- Much tighter integration with SkyDrive
- More options for arranging modern (Metro) apps side by side
- New “first party” (Microsoft-authored) Windows 8.1 apps
- A redesigned Windows Store
- New capabilities for third-party Windows 8.1 apps
- A greatly enhanced PC Settings module that duplicates the desktop Control Panel
- Support for smaller tablets
- Internet Explorer 11, with significant improvements in tab handling and security
- Some new capabilities for the on-screen keyboard on touch devices
- Integrated search
Question: Can the Windows 8.1 Preview be uninstalled?
No. The only way to roll back to your previous installation is to wipe out the installation and replace it with a backup created before you installed the preview.
Question: Will there be a direct upgrade path from the Windows 8.1 Preview to the final release of Windows 8.1?
Probably not. The company’s official documentation does not cover this topic, so your best bet is to assume that a complete reinstall will be necessary.