I really wonder that will Jennifer Geerties and Hanke join NT in 2nd week of VNL?
Hanke will be there instead of Kästner, about Geerties there is no info yet.
Apparently the team that plays Universiade is officially considered as B-NT, coach by Alexander Waibl. So far the names known preparing for that tournament are Emma Cyris, Camilla Weitzel, Lea Ambrosius, Natalie Wilczek, so I guess it might be pretty much the U20 NT plus some slightly older ones to complete the team. I have no idea if the real U20 NT plays U20 WCH, there is no website yet for the tournament and as usual no info from DVV
EDIT: Wikipedia says no.