Windows 8 details: new features, UI enhancements and everything in between -- Engadget
All Windows 7 applications will run natively on Windows 8
• Security update notifications have been minimized to the lower right of the log-in screen
• Refreshed Windows Task Manager suspends apps when they're not running on-screen
• New "Reset and Refresh PC" functions enable simplified system wipe and restore
• HyperV virtualization software comes pre-loaded on Windows 8
• Multi-monitor support now enables a single background across screens, as well as monitor-specific task bars
• Multi-touch support enabled for Internet Explorer 10
• Magnifier function enhanced for desktop manipulation
• Optional thumb-by-thumb input mode
• SkyDrive storage support integrated into all cloud-based apps
• Metro-style refresh for Mail, Photos, Calender and People apps with Windows Live ID
• Settings roam allows for preferences to sync across a user's Windows 8 devices
• Continued update support for Windows 8 Developer Preview Beta
• Even a Lenovo S10 (first-gen Atom + 1GB of RAM) can "run" Windows 8
• There's "no overlays" with Windows 8; Metro-style goodness is baked into the core
• Both Metro-style and conventional Win32 apps will be sold in the Windows Store
• Windows 8 devices equipped with an NFC chip will be able to use a tap-to-share feature to either send content from one device to another, or simply receive content from something like an NFC-equipped card.
• Logins will use a photo-based system
• Apps will be able to natively connect and understand one another (if written as such)
• Built-in antivirus software will ship in Windows 8
• There will not be a different edition of Windows 8 for tablets, and presumably, not for Media Centers either
• It's unclear how many "editions" (Home, Professional, Ultimate, etc.) of Windows 8 there will be
• ARM devices will be supported, but not in the developer preview