There's not much to know about the device yet, such as what OS it will run. In a follow-up tweet to another user who asked if it will run Android, Stephens said Friday, "The question is: Is 2.2 ready for the tablet interface?" I think it is, though not without some work on the UI.
There's some speculation that the Slate is indeed not totally dead, just dead as a Windows 7 device. With HP's acquisition of Palm earlier this year, it makes sense that any devices in this category would run Palm's WebOS, which this device might indeed do, which is interesting when taken with Stephens' question about Android.