The PSP Go has been revealed by the June 2009 iteration of Qore.
The PSP Go features a 3.8-inch sliding screen, is 43% lighter than the PSP-3000, has 16 gigs of flash memory, supports Bluetooth, and has all digital content. Just to reiterate, that means that there’s no UMD drive. It also supports memory stick micro, so you can "add extra memory to it if you’d like."
There will, of course, be a large emphasis on games in the digital marketplace (including Gran Turismo, Jak and Daxter, and Metal Gear Solid PSP games), but movies and other content will be offered as well.
GCN has posted the video of Qore on YouTube, so have a gander at the next iteration of the PSP for yourself below.
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UPDATE: Here’s one last key detail — the PSP Go will hit retail shelves this fall.