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, Calendar 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
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