User blog comment:B214/Question and Answers 3/@comment-79.130.78.230-20140719120320/@comment-5917000-20140719181601

"Short story..... I seriously dont want to see a short story compilation volume for a while.... V13 and V15 was already enough. Hope they release the short story compilation after the main story ends. Ishibumi says that v17 will come out as planned, but it seems like v18 or v19 will become short stories again." ,

This is wat noman(zero) said on bt forum i dont know if its prediction or not though,

anyway still dragons are started to get involve so i guess DxD will also have dragon members and that will be probably in upcoming 3-4 vol's  .