PSP-4000 details leaked?

Buzz has been circulating the internet regardling seemingly leaked details for the PSP’s latest iteration, the PSP-4000.
Apparently, Eurogamer has spoken to an anonymous development source “close to Sony” that has given the following details.
The PSP-4000 will have a sliding screen, similar to that of the PSP-3000, there will be no UMD drive and certain games only utilizing the shoulder buttons will be playable when the screen is slid closed.
What do you think? Is this source to be believed? Let’s just hope it resembles the picture above which has been around for way too long now.