Why all the secrecy around the proposed Seroquel settlements?

Compared to this:

http://www.officialvioxxsettlement.com/calculator/

Could it be that the lawyers and AstraZeneca have something to hide?

Maybe a little bit of sunshine on the Seroquel proposals, including comparisons with Vioxx, Avandia, Zyprexa PhenFen etc. might help the people who have suffered?