Had a very brief go of the 2.1 beta earlier. Some obvious graphical improvement in planets and suns as you approach from a distance. Being contacted by the station adds a nice bit of immersion. Haven't tried a planetary landing yet, visual quality of the terrain and performance is meant to be better. We should have had galaxy map bookmarks from the start.
Hard to tell at this point how much better the AI is, but I did have a run in with a Dangerous rated NPC Python who gave me a reasonable fight. Elite AIs I think are now meant to be more difficult to kill.