The codename is Project Arminius, and the total value is around 40 billion euro.
Of these, 600-650 should be Skyranger close air defence variants. Rheinmetall says they are about to sell more than 1000 Skyranger boxers in total, between Germany and other customers. Also according to Rheinmetall, the Skyranger gun has been proven effective against both drones and rocket/missiles (no distinction between the two terms in German, so unclear what they mean here).

https://www.hartpunkt.de/rheinmetall-sieht-bedarf-von-ueber-1-000-flugabwehrsystemen-skyranger-mehr-als-die-haelfte-davon-fuer-die-bundeswehr/