Rumour has it that the Xbox Series S will not be sporting the Gamecube-esque design when Microsoft releases it later this year. Instead, it may be closer to the shape of the Xbox One. Both the Xbox Series S and Xbox Series X are now slated for a Christmas 2020 release, although the Series X was originally planned for August 2020, instead.
https://www.notebookcheck.net/Respectable-rumour-posits-that-the-Xbox-Series-S-will-be-closer-to-the-design-of-the-Xbox-One-than-the-Xbox-Series-X-Microsoft-s-premier-next-generation-console-originally-had-an-August-2020-release-date-too.478886.0.html
The difference in price MUST be way higher than 100 usd imo. Microsoft can't offer 3x the performance for just a 100 usd more. Nobody would buy the Series S.