On Monday of this week, Microsoft officially announced the editions of Windows 8 that will be available. [They also confirmed that it would be called Windows 8. The release of the logo two months ago was a pretty good indication but it's for sure now.]
They are: Windows 8 and Windows 8 Pro. Each will be available in 32-bit and 64-bit versions.
Very simply, Windows 8 Pro is for techies and businesses. Windows 8 is for everyone else.
I'll save you the rehash and just send you to Microsoft's post:
Announcing the Windows 8 Editions [Microsoft: The Windows Blog]
Check out the excellent table mid-way down the page that compares the availability of major features between the Windows 8 editions.
I like the simplified options, at least compared to previous versions of Windows. What do you think?
ETA: There will also be a Windows 8 RT (aka Windows on ARM or WOA) that will only be available pre-installed on computers (primarily tablet computers) powered by ARM processors. There will also be an enterprise edition called Windows 8 Enterprise. The server version of Windows 8 will be called Windows Server 2012.

Its interesting to see Microsoft addition of window 8s . Is it affordable? Especially for IT Professionals and Students generally. It will help greatly
if it can be download to run with window other earlier editions.
I absolutely love my Windows Phone. Took a chance and took back an iPhone 4S to get it. It’s the best phone decision I ever made, by far.
I’m dual booting Win 8 alongside Win 7. So far, I have to say Metro on my PC (not a touch screen) sucks. The UI just doesn’t belong on a PC period.
Gripe – when you run a web page and narrow the window, the text does not “flow” like it does in Win 7. You are forever horizontally scrolling.
Gripe – Also, clicking (on certain links) does not work. You have to right click to get a menu to go where the link leads you.
Gripe – Everything looks “OLD.” Every application now appears to look like you are running Win 3.1 in 640×480 screen resolution. UGLY.
I do however like its speed in booting, shutting down, and loading pages into IE.
Not a fan. If the RC ain’t a BIG improvement, I’ll stick to Win 7.
So what are we gonna get? Clouds mixing your own files with everyone else’s and call it The File Bleep up? The file encyclopedia under libraries or sopme sort of software that ties everyone in to each other-going to my first point-where anyone can now do whatever tyhey want if you have some skill.
Honestly-unless you get the MS Office 36o-ah-there we go! You got three installs and am sure there is some kind of bug that will corrupt you8r file system until you are forced to buy a new copy of Windows Office again?