Blend4Web 16.03 Developer Preview is available. In the upcoming release:
  • Petigor's Tale assets
  • environment animation mode in Play Animation and Stop Animation logic nodes
  • input system rewrite, new input module
  • Get Timeline and JSON logic nodes
  • new math module
  • animated node materials in Blender Viewport
  • backward compatibility with older Blender versions and much more

The stable release is scheduled in the middle/end of the next week.

For the list of new features see the release notes inside SDK builds.