There are no real details on the games as yet aside from the ESRB's related descriptions.
For the Uncharted themed game they write:
"This is a pinball game designed around the artwork and themes of the video game Uncharted: Drake's Fortune. Players use flippers to hit the ball around a crashed airplane, into silhouetted character targets, and off bumpers shaped like gold coins to score points."</blockquote>
If the games have been rated then it's right to assume they exist, so we guess we'll be hearing more about these in the future. It's possible the games might launch separately as PSP Minis.