It is near half year after Cinema 4D 2026 release and still no D5 Sync for it.
C4D 2026 was released last September 10, 2025. As of now, it is still in development. 
Exactly two months ago. As I know they didn’t made such many changes to recreate plugins.
Cinema 4D 2026 gets new update day ago. New cloner tools are very powerful for modeling complex details and it is problematic to export scene to old Cinema 2025. It is more and more difficult to work with latest Cinema 4D in companion with D5 Render because we still don’t have C4D 2026 D5 Sync.