User blog comment:Xhatefate/DxD Updates~/@comment-6096197-20140105182800/@comment-1359322-20140111025727

Well that's why they are trying to produce several new anime. To try and keep more budget so that they could have enough budget should they decide to continue DxD S3, Volume 5 and 6 requires way more budget than S1 & S2. Possibility that it might go around 15 episodes.