It's been forecast for years, and now it's here. Negative interest rates, as rare as they are, usually signal a bottom as that's when the powers that be give up trying to manage against deflation, preferring to manage against inflation. ...and that usually fails.
http://blogs.marketwatch.com/worldcup/2014/06/05/ecb-live-blog-after-rate-cuts-pressure-remains-on-draghi/