Both come from Japanese companies.
Both are destined for the PSP.
Both are slotted for the summer time frame.
Both are prequels.
Both are reasons for me to pick up my PSP again.
Metal Gear Solid: Peace Walker was pushed back to June 8th, 2010 and will serve as the fifth installment of the Metal Gear Solid franchise despite the subtitle. There’s also a green PSP bundle with it, but I don’t think anyone cares about that. Those of you who are interested in the title should check out the latest walkthrough though.
As for Kingdom Hearts: Birth By Sleep, its release window was narrowed down to simply “summer“. I don’t know much about it, just that it is the fifth installment for its own franchise as well.