As announced by Apple, the black and slate version of the OG Apple iPad mini has been replaced by a space gray model that already is available at Apple Stores; some of the larger-sized stores had the tablet in stock early in the day on Thursday, but the model was sold out by closing time. The space gray model was originally brought out to replace black and slate with the Apple iPhone 5s...Source: http://www.phonearena.com/news/Space-gray-Apple-iPad-mini-hits-the-Apple-Stores_id48696
