The next GA level client is planned to be released towards the end of September 2017, the current version in the link above as well.
The key features being worked on for the next GA client are -
Bug fixes and stability improvements
Enriching automation in the client (detection of more information types through alignment with the Office DLP rules) and improved condition matching engine.
Improving the Information Workers experiences (including a label action for ‘user defined permissions’ and a new labeling experience via the ‘protect’ menu for organizations that want to minimize the information protection bar)