We've previously seen the pics of the BlackBerry "Magnum" prototype. But, just in case anyone out there needed more proof the device was at one point or another, on the BlackBerry roadmap Cellguru has done up a quick walkthrough video for everyone. Since there is no OS or anything loaded it's more of a hands on look at what could have been for the "Magnum" but RIM has since moved on. Rather interesting to see the SurePress implementation here. Sound off in the comments.