The most obvious thing about Dell's ignorance-promoting product page for the XPS13 (the differences are only defined in marketspeak) is that there is still no SSD available:
Says right there on the page you linked that the $999 base model comes with a 128GB SSD. So does the final summary if you went through their configuration tool (which is admittedly laughable because all it allows you to configure is what level of Windows/MS Office licenses you want bundled, warranty coverage, and accessories like a monitor/printer).
Says right there on the page you linked that the $999 base model comes with a 128GB SSD. So does the final summary if you went through their configuration tool (which is admittedly laughable because all it allows you to configure is what level of Windows/MS Office licenses you want bundled, warranty coverage, and accessories like a monitor/printer).