Can you say damage control? According to CNET, Sony and it's partner, First 4 Internet, have quickly scrambled trying to contain both the PR damage and the potential damage to users' computers. They've released a patch to anti-virus companies that will elminate the DRM rootkit's ability to hide.
I agree with Ed Bott that this is not the end of the story and it certainly raises some intriguing potential issues of legality. More on that in a minute. Michael links to this article on Wired that article from Wired that also calls Sony's practicies into question.
Sony will run and hide behind inadequate and confusing laws. They'll plead their case for DRM to protect their interests. When all is said and done, I think the judge in Chicago has it right and cuts to the chase. It's trespassing.
