There is no "updated" Model X or Model S coming, only a number of minor ongoing changes. The main change in the last few years was to use high efficiency Model 3 rear drive unit as the S / X front drive. It went into production 3 months ago.
̵1; Elon Musk (@elonmusk) July 9, 2019
In response to a query on Twitter, Musk said that while there is no "updated" model X or model S coming, we will continue to see a number of minor changes. He also added that there is no indoor revolver on the agenda either. However, what will happen to X and S in the longer term is still up for debate. There will inevitably come a time when Tesla turns its full focus to its independent efforts, although Musk has confirmed it will not be any time soon.