CRM SDK For WinRT or Win8 App

Hi, I am new to CRM and I need help. I want to develop a Win8 App for CRM and I had done some search on this.  I found this blog:

http://blogs.msdn.com/b/dynamics-coe/archive/2013/01/21/building-dynamics-crm-applications-for-windows-8-practical-approaches.aspx  which provide some info on creating Win8 For CRM.

The Problem :

1) These  CRM libraries (WinRt.Microsoft.Crm.Sdk.Proxy and WinRt.Microsoft.Xrm.Sdk) are for CRM Online.  If I want to develop CRM on Premise, Are there any latest WinRT-base CRM libraries for CRM on Premise?

2) Metro CRM app preview in Winter 2013, full release in Spring 2013.

Dynamics CRM client app for Windows 8.
http://www.zdnet.com/microsoft-commits-to-delivering-windows-8-crm-app-by-mid-2013-7000006758/

Is this WinRT CRM Client is some kind of SDK ?

Thanks