A mysterious new British luxury brand has teased us with an image of a new crossover vehicle it will be showing at the upcoming 2011 Frankfurt auto show.The new brand, called Eterniti, is especially cagey about its new display, called Hemera, with its media release stating only: "A different kind of luxury car brand. A luxury car brand from London. Eterniti Motors."STORMY DAYHemera, in ancient Greek mythology, is the goddess of day but in a preview video available on the company’s website, Eterniti promises a “powerful” and “intense ... storm of limitless power” to the sound of a roaring sports car with visuals of headlights and a rev counter intermingled with storm clouds and rain. From the single sketch released, the promised Hemera appears to be a crossover SUV but more details will be revealed at the vehicle’s September 14, 2011 unveiling, the company said.