There's an update on their development log highlighting some of the recent advancements. This work includes improved quality of LightWorld within their renderer, support for new mask formats, an SSAO/SSDO (Screen Space Ambient Occlusion) visualization mode, other improvements to SSAO/SSDO, and optimizations to object surface rendering that results in lower CPU usage. Besides improvements in the Unigine renderer itself, there is now a GUI texture manager, a speed-up of the widget canvas, improvements to Unigine Script, full support for sound on the Sony PlayStation 3 with I3DL2 multi-zone reverberation, OpenAL improvements, reduced memory consumption, less memory allocations, a "huge" speed-up of file-system search, and much more.
Unigine Corp has also begun producing video tutorials on their engine. There's their first one embedded below but it's not particularly interesting to most (it's just on exporting 3DS Max objects to the Unigine Engine).