There are plenty of new features heading onto Dev-Branch just as you read these lines. Our programmers have decided to make the lives of content creators easier, mainly for those creating new models. They will be able to use a technology that generates shadows of objects on-the-fly based on the shape of a resolution LOD. Two occlusion-related features are joining the party too, one of them being a new ambient occlusion technology HBAO+ (available in the Video Options > AA & PP). The other allows creators to place shapes and faces that prevent drawing of anything behind the so-called Geometric Occluders (developed for our company's new Enfusion engine, parts of which can still benefit Arma 3). This has not been fully implemented in our data yet, but it should provide a gain of performance mainly in urban areas. Existing content will continue to work, but using the new tech will require models to be updated to benefit from it.
All these new features still need to be properly documented, and that brings us to the most important change: new parallax technology for ground surfaces. It's been already documented on the Community Wiki, because it changes the way parallax behaves even for custom-made terrains! The effect will likely work, but its depth may be more than you'd like. See the documentation for a simple guide on how to correct this. The major benefit of this change is to remove the ugly artifacts when moving close to the ground. We hope you are going to like these post-holiday gifts and we're looking for your feedback on them.