A listing on a Spanish retailer website seems to suggest that a model of the Xbox One that contains double the storage space than the current one does could be coming from Microsoft.
The listing doesn’t include much information other than a price of €449.99, and a supposed release date of June 23.
The interesting part about this release date is that it gives Microsoft a chance to announce a new Xbox One model during E3, with the chance to reveal that it could be available in stores less than a week later.
http://www.gamespresso.com/2015/05/09/rumor-1-terabyte-xbox-one-coming-during-e3/