The mode is unchanged, here are the 12 teams formally qualified for the group stage (round 4) of the competition:
Turkey: Galatasaray ISTANBUL, Fenerbahce ISTANBUL
Russia: Dynamo MOSCOW, Dynamo KAZAN
Poland: Chemik POLICE, Budowlani LODZ
Azerbeijan: (Telekom BAKU bailed out), (Azerrail BAKU -> Challenge cup)
Germany: (SSC Palmberg SCHWERIN -> CEV cup)
Switzerland: Volero ZÜRICH
Italy: Igor Gorgonzola NOVARA
France: ASPTT MULHOUSE
Remarks: Schwerin was considering not to participate, but I can't believe they will skip it and embarass both CEV and VBL as well disappoint their players. Others seem to participate so far I know, despite Lodz may have a really hard time there without some key players... But the mode is too hard for most weaker leagues anyway. Should some team not participate, like in the 2017 season Alba BLAJ from Romania will inherit the free slot.
Qualification field is very uncertain, you have to wait, who wants to participate. For sure the power teams of the top nations will be there, i.e. VakifBank ISTANBUL from Turkey, Imoco CONEGLIANO from Italy and Yenisey KRASNOYARSK from Russia.