Whispers of a new or revised PSP have been growing decidedly louder as of late, and now 1UP's gotten a ton of new details from what it claims are "sources directly involved with the new system" -- our favorite kind of people, actually. Here's what they were told: UMD is out, replaced instead with options for either 8GB or 16GB of built-in flash memory. Also nixed is any hope of a "PSP-4000," with Sony opting instead to use a subtitle. Three rumored names include PSP Slide, PSP Flip, and PSP Go!, the latter of which borrows from Sony's pre-existing Go! brand and suggests
