As well as a new trailer (below), the Arma 3 Apex expansion also got a release date at the PC Gaming Show. That release date is 11 July, but those who pre-ordered Apex (or own the Apex Edition) can get ‘sneak peak’ access to an early build right now.
To do that, you right-click on Arma 3 in your Steam library, find Properties, go to the betas tab, and select the sneak preview build. Steam should then update your version of Arma 3 accordingly. Again, only if you’ve pre-ordered or own the Apex Edition.
Here’s the trailer, confirming the release date and showing more of the South Pacific environment.