At this year's International CES, Speck showed off a few new limited production run iPad 2 cases that are available only from its website. All of the cases are updates to the company's FitFolio, which earned a strong general recommendation when we reviewed it in May. While that model is still available, Speck has updated the closure on both new models from an elastic band to a magnet, with a corresponding name change: MagFolio ($60). There is also…