Here's what I found on the Wiki page:
"On March 15, 2014, a new TV anime series was announced. The main staff from the first series will return; however, it will be produced at Studio Shuka instead of Brain's Base. It is set to air in three different seasons, each lasting for one cour. The first season is scheduled to begin broadcasting in January, 2015 with title Durarara!!x2“承” (Shou), the second season in July, 2015 with title Durarara!!x2“転” (Ten) and the third season in January, 2016 with title Durarara!!x2“結” (Ketsu)."