After unexpectedly announcing leather cases for the new iPod nano before the device itself was unveiled, Hong Kong-based Uniea has proved stunningly fast out of the gate with actual cases for the third-generation iPod nano. The U-Suit for iPod nano (3G) is a puffed leather case that's been lined with soft fabric and internally hard-reinforced with plastic to preserve its nano-sculpted curves. Full bottom port and switch access is provided through…