User blog comment:B214/Don't ask about season 4/@comment-86.150.43.71-20161018074021

Keep your eyes open for the Fantasia Bunko event on the 22nd guys. DXD is on the main stage, and on the poster its self along with Date a live, and a couple of other animes which have hinted at new seasons. They'll be doing a confidential special talk and quote 'the time is now'

I'm just relaying stuff from the Fujimi Shobo website; so have a look for yourselves and come to your own conclusion.