https://wccftech.com/xbox-series-s-lockhart-reference/

The Xbox Series S/Lockhart console has yet to be officially announced, but it seems like it is indeed real as the rumors that are circulating online suggest.

Twitter user TitleOS recently discovered a reference to Lockhart in the Windows OS libraries. While the reference doesn't mean a whole lot by itself, it would make no sense for Microsoft to include it if the console is not coming alongside the Xbox Series X.