D2 16.5 is available to download (in fact, I think it’s the only Documentum product available in 16.5, not even CS is yet available) including the new UI for D2.

The current version of D2 Smart View Client is ideally suited for users with a content consumer role where searching for and viewing documents is the primary focus. To access more advanced features such as Content Creation, Advanced and Query form searches, Workflow Processing, and Virtual Document creation, users should switch to the D2 Classic Client