Sony has announced a Converter Cable Adaptor for PSPgo that allows existing PSP peripherals, like the 1Seg Tuner and GPS Receiver, to be used.
Despite the Cable title, however, this piece of kit has a plastic frame that clips around the PSPgo and turns the shape from compact to clunky. The pictures mention that the design is a prototype, and subject to change. Quick, complain.
There's no word on price nor date yet, but we expect those to be clarified soon.