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Then there's the redesigned dock connector, dock connector plug, and cable. The old 30-pin dock connector is no more, and in its place is a new 8-signal, reversible connector called Lightning.
Oh, and so we don't have to landfill all out accessories and go out and buy new ones because there's a handy adapter that's also been talked about a lot - but this is going to set you back $29.
Image source: Apple.