The SR-556 is a small thing for Ruger, considering its market share Ruger wouldn't be amiss in dropping it if the AR-15 market went south, so its not crazy that Ruger might have evaluated the costs of stopping production.
As for a press release, I can't see much up side for a gun maker putting its name out there right now whether is annoucing dropping a product or standing by one. More likely Ruger is seeing which way the wind is blowing.
I doubt that Ruger is that stunned, Yes they are close to Newtown, but they have had several days to think things through and come up with a set of responses. As far as legislation and any possible changes those are still unclear so its likely wait and see at Ruger. Smart move if you ask me.
