I guess that most findings and things you can do are discussed already in the “Modding Stonehearth’s Graphics Test”-thread. Let me link to that thread instead of repeating all the things (quite some). As you have said… it is a very limited version and my feeling is that there is not so much to discover on the surface (apart from the mentioned controls).
On the concern side… nothing new from this test for me. I see it as a simple test of the graphics engine. We do not see anything of the GUI, cannot execute any activities and probably even the movement might be only in so that you can fly around and cause more issues to the engine (which will be reported). I am looking forward to the first, playable release and than we can say a bit more I guess. But for sure it is nice to have a piece of Stonehearth in our hands already.