Great news this, if true :). Nokia is reportedly working on a Windows RT tablet and not only this, this tablet is currently used by Microsoft to test ARM based Windows Store apps and even sent to Microsoft partners for testing their apps. Nokia has maintained dignified silence on confirming that they are working on Tablet, but at the same time always mentioned that they are watching the Tablet space with interest.
Now, WMpoweruser has confirmed from their sources that Nokia is working on a Windows RT tablet. Keep your fingers crossed then !!