Just looked at ANN's article for S2:
The anime's official website revealed that Katsumi Ono, an episode director on the first season and the director of Hataraki Man and Yu-Gi-Oh! 5D's, is replacing Tatsufumi Itō as the director of the new season. Chief animation director Satoru Fujimoto is also assuming the character design role from Satoshi Koike. Akifumi Kaneko is returning to write and oversee scripts, and original character designer Dan Yoshii is also reprising his role at Satelight. Romain added that "there will be new (singing/ main) character(s) too."
http://www.animenewsnetwork.com/news...season-in-2013