Here is a sneak peak into the approaching 1.6 update. The overall feel of the new update has a more tropical experience.
If you wish to explore yourself, right click Arma 3 in steam. Click properties, betas, "enter beta access code to unlock private betas:" enter code "Arma3Update160RC".
Left is 1.6, Right is current version (1.58)
Both sides have everything set to ultra. With 1.6 a new feature is added under video settings "water reflections". I had set this to max when taking these screenshots.