In 2011, the Super Bowl became permanent. In the past, each previous Super Bowl had their own logo. The one introduced in 2011 became a permanent design with only the number and some small regional details changing. I also found an article that blames Janet Jackson’s wardrobe malfunction for the new design.
2011 Logo Design for Super Bowl XLV (Jan 31, 2011)
Super Bowl Logo Design through 45 Years (Feb 6, 2011)
The Super Bowl Gets a New Look (Mar 2, 2011)
The Naked Truth on How Janet Jackson Altered Super Bowl Artistry (Feb 5, 2012)
