Microsoft Codenames : What is the codename for Windows 8 ?

A lot of Microsoft's product has a codename, especially Windows.
These codenames are used in discussion prior to the official release. 


There has been some suggestion that Microsoft may move towards

defining the real name of their upcoming products earlier in the

product development life cycle so as to avoid needing product

codenames.

I been looking for these codenames for quite a long time.
But, i'm curious : What is the codename for Windows 8 ???

I've checked the list on the link down here but, there is no Windows 8.

List of Microsoft Codenames

Few days ago i found a wallpaper that says "Windows 8 codename : Chidori"
(Sorry, I've deleted that wallpaper)

And i was like "Chidori ? What is that ?"

So what do you think ?
What's the codename for Windows 8 ?
Does Microsoft stops using these codename for their products ?
Or, Chidori is the answer ?
Post your comment below.