Sony recently launched their E3 coverage site, which details what they're going to be unveiling at the show and what games they're working on for their systems.

...eventually, anyway. While the site is open, there's very little actual content on it so far, though the flash video contained within the site has confirmed that the sequel to the PSP puzzle game Lumines will be present at the E3 show this year.

E3 Coverage:
http://www.us.playstation.com/Content/Site...owCoverage.html