Steinberg has updated Nuendo to v6.5.40. This maintenance update provides full compatibility with Mac OS X 10.10 Yosemite in addition to extensive product maintenance in areas such as AAF, MixConsole, performance, compatibility and more.
A detailed Version History as well as the download installers are available here.
Steinberg has also released a new firmware update for Nuendo SyncStation. The firmware including a new version history can bedownloaded here.