Dell in a new Facebook teaser on Friday gave clues to its new ultrathin notebook and raised serious concerns about its originality. Without giving clues as to features, it showed the XPS 15Z, a 'thin, powerful, intuitive' shape which borrowed very heavily from Apple's unibody MacBook Pro. The design shares the same all-silver frame and black bezel, patterned speaker grills on either side of a chiclet keyboard, and even a five-dot, button-activated battery indicator.