
At Build 21011, Steven Sinofsky showed the various features of Windows 8 to its attendees. There were lots of things shown in walkthrough but i will give a short summary of it. Microsoft has also released a developers preview for download. Check that here.
- 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 with both Metro UI and Desktop UI
- SkyDrive storage support integrated into all cloud-based apps
- Metro-style refresh for Mail, Photos, Calendar and People apps with Windows Live ID
- First-gen Atom can run Windows 8
- 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
- Logins will use a photo-based system
- Built-in antivirus software will ship in Windows 8
- There will not be a different edition of Windows 8 for tablets
- ARM devices will be supported, but not in the developer preview

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