Anything people say now is pure speculation as Microsoft has not announced anything regarding developing for Windows 8. That will come out this fall as the Build conference (formerly PDC).

But, based on it using a UI similar to WP7, Silverlight is a good guess.

>Now that Windows has announced it will be releasing Windows 8, which will run on a Tablet,
>I want to develop apps now that will port to Windows 8, and run on a Windows tablet.
>
>As Windows 8 is not out yet, I will have to develop for windows 7 now, but the eventual goal is to run apps
> locally on a Windows tablet (Without Internet connectivity all the time)
>
>Any ideas on which of the following technologies I should use now ?
>Windows Forms
>Web Forms
>Silverlight
>WPF
>A.N. Other ?
>
>TIA
>Gerard