Ars can confirm support for 4K video, lack of power brick; price, date not yet known.
Rumors and insider tips have pointed to an Xbox One "slim" model being revealed at this year's Electronic Entertainment Expo, and the news was so good, someone at Microsoft couldn't wait to spill the beans.

Images found by multiple NeoGAF forum members confirm the news of the new "Xbox One S"—and the ability for gamers to pre-order it soon enough. Multiple Xbox sources had recently confirmed to Ars that some sort of "slim" system would be announced at this year's E3 and that a major part of its bulk reduction (which has been measured by Microsoft as "40 percent") will come from the removal of its AC adapter's "power brick," which will make this the first Xbox-branded console to nix that bulky portion.

The leaked announcement image also confirms news that the Xbox One S will support 4K output, though Microsoft sources have informed Ars that 4K support will mostly manifest in the system's menus and in any streaming app that announces support for 4K output in the future—meaning, this will not include the kind of hardware upgrades needed to automatically boost current software to 4K resolution. The announcement image also trumpets support for high dynamic range (HDR) imagery, a vertical stand, and a "streamlined" controller, though we have yet to learn what exactly will be streamlined or changed in that controller.

Oh, and it's going to be white. Quite white, from the look of things.

The leaked image did not include a price point or launch date estimate. We have reached out to Microsoft asking about the accuracy of the leaked store listing, and we will update this report with any response.