Everything I've read about the Superchargers say they will be free for Model S users forever. What about Models X and Gen III? Any thoughts?
Superchargers are not free... S85 it is included in the price, S60 it cost you $2k at ordering. However you do not pay for the usage. Will it be included or an option on the X or Gen3... your guess is as good as mine.
Model X will be the same as the Model S.
Gen3 will be an option: Elon Musk has implied base Gen 3 will remove standard Model S/X stuff in order to keep the base price down.