User blog comment:B214/Season 3 confirmed!!!!!!/@comment-25537445-20150228183855/@comment-1359322-20150301222720

Simple, 1 cour = 6 DVD/BD. 2 cour = 8 DVD/BD.

Now unless if TNK can guarantee that they'll be no drop in quality for the 2nd half of the show, otherwise people aren't going to buy pass 4 DVD/BD. So it'll be like a gamble which if ended badly may result in the DxD project being cancelled.