According to the changelog, Dropbox 2.11.0 brings a completely rewritten user interface (UI) for both the Linux and Windows versions of the application. In addition, it comes with file identifiers, long path support on the Windows version, and a new headless setup flow for the Linux edition.
With Dropbox 2.11.0, users will experience faster upload times when working with small files. Additionally the splash screens have been updated and Finder icon overlays have been added on the Mac OS X version of the client.