A new version of Gmail will roll out within the next few days. It will include priority features, a new design, and most importantly new security protections.
Emails with sensitive information can be put in "confidential mode."Also users can have a message expire after a set amount of time, to prevent it from resurfacing years later.
There will also be an option that can revoke emails at any time.
The new features will first be delivered to G Suite via an early adopter program, with plans to expand to all Gmail users at a later date.