The PSP-4000 model may be just around the corner, as a new LittleBigPlanet advert suggests. The below advert for the LittleBigPlanet PSP Accessory pack, which ran in MCV’s latest “Digital Edition”, references the PSP-4000 in addition to the current PSP models and the PSPgo. The details on the PSP-4000 has yet to be revealed, but we speculate that it will still feature the UMD drive and be even smaller than the PSP-3000.