The main items to point out with the latest Unigine Engine revision is there's now support for Occulus Rift. Occulus Rift is the promising low-cost virtual reality head-mounted display that was born as a Kickstarter project. Unigine is making the Occulus Rift VR HMD support available through an "AppOculus" engine plug-in and they'll soon release new versions of Heaven and Valley that offer this feature.
When it comes to the engine's renderer, there is a brand new decals system, improved AMD OpenGL performance, and various other enhancements. UnigineScript also now supporta asynchronous operations.
More details on the recent Unigine improvements can be found in this devlog entry.