Konami announced this week that Metal Gear Solid: Peace Walker
will be hitting stores on June 8th in the US. You can either purchase the game on it's own or in a spiffy PSP Entertainment Pack which will include a nice green PSP 3000 that's themed for the game. I'm not sure why they aren't offering a nicely colored PSP-Go but I'm just reporting what they've told us.
To further whet your appetite for the game Konami has released some new footage from the game which shows off some of the new features in the game (which I imagine will finally get John to purchase a PSP or at least nag me to borrow mine).