I don`t want to spoil the party, but I have some critics about the usage of this new feature.
- the position of the sun should be in a special range only. There is no feedback of blender when wrong angles are used
- there is no direct visual feedback of the sun position.
- I can see, where the sun ray comes from, but I have to think mirror-inverted to guess, where it will go to.
This is not very user friendly and self-explanatory.