Black, bezeled and rectangular? That's pretty much the go-to design for tablets nowadays. But lately Sony's been straying from the pack and taking a different aesthetic tack, which it recently showcased with the Tablet S and P. On the showroom floor at CES, however, the company had two newer models secured behind glass to give consumers a sense of future form factors. These prototypes -- known prospectively as the Hybrid and Slate -- fall under the