All signs are pointing towards Dell releasing the XPS 15 7590 in the final week of June, specifically from June 24. Its Premium Customer support has reportedly been saying so as has XPS Vice President & General Manager Frank Azor. People in some countries are looking at a prolonged wait, though.
https://www.notebookcheck.net/Dell-to-launch-XPS-15-7590-on-June-24.424118.0.html