Microsoft has announced versions of Windows 8. Here is a comparison chart from Microsoft featuring Windows RT vs Windows 8 & (Win8) Pro:

Feature name Windows 8 Windows 8 Pro Windows RT
Upgrades from Windows 7 Starter, Home Basic, Home Premium

x

x



Upgrades from Windows 7 Professional, Ultimate x
Start screen, Semantic Zoom, Live Tiles x x x
Windows Store x x x
Apps (Mail, Calendar, People, Messaging, Photos, SkyDrive, Reader, Music, Video) x x x
Microsoft Office (Word, Excel, PowerPoint, OneNote) x
Internet Explorer 10 x x x
Device encryption x
Connected standby x x x
Microsoft account x x x
Desktop x x x
Installation of x86/64 and desktop software x x
Updated Windows Explorer x x x
Windows Defender x x x
SmartScreen x x x
Windows Update x x x
Enhanced Task Manager x x x
Switch languages on the fly (Language Packs) x x x
Better multiple monitor support x x x
Storage Spaces x x
Windows Media Player x x
Exchange ActiveSync x x x
File history x x x
ISO / VHD mount x x x
Mobile broadband features x x x
Picture password x x x
Play To x x x
Remote Desktop (client) x x x
Reset and refresh your PC x x x
Snap x x x
Touch and Thumb keyboard x x x
Trusted boot x x x
VPN client x x x
BitLocker and BitLocker To Go x
Boot from VHD x
Client Hyper-V x
Domain Join x
Encrypting File System x
Group Policy x
Remote Desktop (host) x

To sum it up, Windows RT will be specifically for tablets while Windows 8 versions are targetted at desktop PC users. Windows 8 is kinda basic version of Windows while the Pro and Enterprise versions will have some added features. Microsoft is expected to release Windonws 8 later this year.