According to Weekly Shonen Jump, the second season of Nurarihyon no Mago
was announced. More information will be revealed in the later issue of the magazine.
Source: Scan of WSJ
Update on May 7th
According to Nurarihyon no Mago's official website, the second season will be titled "Nurarihyon no Mago: Sennen Makyō". The new season will start this July.
Source: official site
Nurarihyon no Mago: Sennen Makyou