Yes, Adidas has been confirmed for some time. The association's announcement dates back to March 21, 2025. They immediately became the supplier for the beach volleyball area. However, they won't be the supplier for the national teams until 2026 due to the existing contract with Kempa. Adidas is also entering into a collaboration with WePlayVolleyball, as they themselves haven't had any experience with volleyball for a while. Adidas was last a supplier for German volleyball in 1996.
Link: DVV und adidas: Ein neues Kapitel für den deutschen Volleyball
And in Austria, it's been known for a while. It was announced there on April 26, 2025. Adidas immediately became the supplier, so Austria has already played in Adidas jerseys in the Silver League and the European Championship qualifiers. Here, too, Adidas entered into a collaboration with WePlayVolleyball.
Link: adidas und WePlayVolleyball neue Ausstatter der ÖVV-Nationalteams