Rumours started flyinging when an advert for LittleBigPlanet accessories mentioned a mystery PSP 4000.  On page 17 of the Digital Edition of the Games Industry Mag MCV it states that the advertised accessories are compatible with the PSP 4000. It is uncertain at this stage whether it was a misprint or a look into the crytall ball of things to come from Sony.

Alex Seedhouse from the The Lost Gamer, the site that initially broke the story, says:

I guess it won’t be 100% official until Sony themselves reveal it, yet this pretty much outright confirms it.

The jury is still out but we might just see something new from Sony in the coming months.