It seems about time for a new Model S. I mean really... 8 years a a long time. And the original concept (with basically the same design) came out 3 years before the production model.
There were talks of a new interior a few months ago. But Elon Musk answered the rumors by tweeting that "no refresh for Model X or Model S is coming". Only minor ongoing changes. Which could actually mean an all new one is on its way. Or at least, being developed. Which will be necessary soon if Tesla wants to stay competitive in the luxury car market. Not only all of its competition has been redesigned. But soon, they will all have luxury EV models as well.