I'm also looking for more info on this. This is the first link I've come across. No matter what side of the "vaccine debate" you are on, this should be concerning.
Google "Merck mumps lawsuit" and all kinds of articles come up.
This lawsuit was filed in 2010, and unsealed in 2012. It's rather quietly disappeared since. I supposed you could emil the attorney for the plaintiff listed on your link and ask what is going on. Given Merck's history of lying about safety of their products, I expect they've lied about the safety of all their vaccines, as well as having fudged data.