It was just one of these casual quick hacks (about 10 lines of code), but QGroundControl now also allows to use Google Earth for visualization, including the new trees feature. We're just in the beginning of the integration, a binary including this feature should be available next week.
While Google Earth is very shiny, it does not allow adding additional visualization components with the same degrees of freedom as OpenSceneGraph and osgEarth. We will therefore push the OpenSceneGraph/osgEarth integration further, as osgEarth also allows for better offline use without internet connection. As our MAVs collect aerial images, osgEarth allows to directly render them into the scene (as 3D mapping), a feature missing in Google Earth. But since we now support the best of both worlds, QGroundControl users have all choices at hand.