Sorry in advance for the double post, but this contains news and not a reply.
their website today with news of the new opening/ending themes. The new OP will be sung by Saori Kodama and will be entitled Mikansei Stride
, or "Unfinished Stride." The single will be released on 2012/08/08. Kodama wrote the lyrics to the first OP/ED, and will likely write these as well, but this is her first performance in a while.
The new ED will be sung by "Eru Chitanda" (Satomi Satou) and "Mayaka Ibara" (Ai Kayano) again. It is entitled Kimi ni matsuwaru Mystery
or "The Mystery around You." The single will be released on 2012/08/22.