Apparently the information being released to the PGP 10 today consists of around 20% of each volunteer's exome, a total of less than 1% of a complete genome sequence - but with the promise of much more to come. Ultimately, the PGP aims to provide complete genome sequences for all of its volunteers, which will become more and more feasible as the cost of DNA sequencing continues to plummet.
There won't be any major medical breakthroughs from analysis of the PGP10 data, but this is a tremendous first step in the direction of personalised medicine. It's also an important experiment to see whether the noble open-access model of the PGP can survive contact with reality. As Church notes in the NY Times article: "We don't yet know the consequences of having one's genome out in the open. But it's worth exploring."

Anyone who's interested in getting their genome sequenced by the PGP - and sharing the resulting information with the world - should consider registering for inclusion.