Dell is seemingly planning a staggered roll-out of the XPS 15 7590. Having previously stated that the upcoming 15.6-inch laptop would be available to order by June 23, it now seems that only applies to those living in the US.
https://www.notebookcheck.net/XPS-15-7590-Do-not-expect-a-June-release-if-you-live-outside-the-US.423582.0.html