A major Japanese retailer, Geo, has listed a PSP-4000 model in a lineup of products to be released this calendar year. Also included was a listing for the Nintendo 3DS, suggesting a 2010 release in Japan for both consoles.

It was a surprise not to see an new PSP model at E3 this year, but perhaps Sony will be trying to pull the same trick Microsoft did the with Xbox 360 Slim and release it on the same day they announce it (and give it to a room full of games journalists for free, causing them to whoop with delight). Obviously this is to be taken with a pinch of salt, as all retail listings are, but a PSP-4000 seems likely, given the track record of Sony releasing a new SKU every Autumn for the last few years.

[Via Siliconera]