Recently it was rumored/leaked that IS would be getting a second season, well know it has been officially green-lit!
"The production and publishing company Overlap revealed the promotional campaign for the launch of its Overlap Bunko imprint on Monday, and the campaign's website shows an announcement of a new television anime for Izuru Yumizuru's Infinite Stratos light novel series. The website previews the folded handout included in Overlap Bunko's books, and the handout's front page reads, "Infinite Stratos: Production on a New TV Anime Green-Lit!"
Overlap will resume the science-fiction romantic comedy light novel series with the eighth volume on April 25 as part of the Infinite Stratos "reboot" project. The light novel series already inspired a 2011 television anime. Sentai Filmworks and Section23 Films released the complete anime series in North America."