Minecraft currently supports: Windows XP - Windows 8. Linux And recently All types of Apple.
Minecraft does not need to update for it to be compatible with Windows 8
YES
I have windows 8 too. All you have to do is windows button+r then type in %appdata%
Yes
There's no reason why it shouldn't run on Windows 8.
On the Minecraft download page, you can download a Vanilla (standard) Minecraft server for Windows, Mac, and (I think) Linux.
Any game designed to run on DirectX 11 or higher will run on Windows 8, as well as native Windows 8 apps. Games that are designed to run in, for example, XP or lower, may not run correctly in Windows 8.
That's like asking if the internet can run on Windows 8. Of course.
Minecraft will never have official support Marcus 'Notch' Person said, however you can still run it its just the first time you go to run Minecraft it will say that the program has been blocked so you need to hit more info than run anyways.
Windows XP: Open the start menu, click "Run" then type %appdata%. It will open a folder with Roaming in it. Open that, and then click on the .minecraft file. Windows 7: Open the start menu, and then type %appdata% in the search bar. It will open a folder with Roaming in it. Open that, and then click on the .minecraft file.
They announced it on Christmas (2012), so yes.