Surface Tablet Pro Question (Dual Monitor Support)

I'm wondering if the Pro version of the Microsoft Surface tablet will offer not only offer TRUE multitasking (i.e. opening up multiple windows on the desktop) but also, a dual monitor screen option (extending the desktop to a second screen). Obviously, it can duplicate the screen given their presentation using the display port, but if the surface Tablet Pro is supposed to be a full PC on a tablet, then shouldn't it have both the ability to open multiple windows as well as do an extended monitor option?