A new Medaka Box novel will be released in October. It's titled "Medaka Box Gaiden - Good Loser Kumagawa Novel Version (Part 1) 'Suisō ni ugomeku nō darake'". Here is the amazon page:
http://www.amazon.co.jp/dp/4087032787
Kumagawa in a (at least) two part Nisio novel... This should be quite amazing.