No, at least not that they have announced. They did however, publicly announce that they have done this because of some "irregular activity". Millions of Facebook and Twitter accounts, among others, were compromised yesterday, so many analysts are thinking Sony did it because people use the same password and email combination for many of their sites. (i.e. your email and password combo is the same on FB, Twitter, PSN, XBL, etc)
Edit: Mine was changed this morning too. Also, here's the link to the source I was talking about. The Verge
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