User blog comment:B214/Volume 22 spoilers/@comment-50.139.232.230-20160722235436/@comment-9595671-20160723014149

It probably won't be "ExE" for one reason, Volume 21 revealed there is an ExE world and that may or may not be the world the UL in EX come from.

So it'd be College DxD if it's still in the same world as before, otherwise it'd be another series.