Best answer: Almost certainly the Xbox Series X has an internal power supply. While we don't have official word, the figure-8 power port and our own information points to an internal power supply.
- 4K while you wait: Xbox One X (From $300 at Amazon)
- HD today: Xbox One S (From $212 at Amazon)
- Discless HD gaming: Xbox One S All-Digital (From $160 at Amazon)
- Contract option: Xbox One All-Access (From $20/month at Amazon)
Power bricks be gone
The original Xbox One from 2013 shipped with a monstrous hulking power brick complete with its own cooling, as Microsoft sought to take as much heat out of the Xbox as possible. This was possibly a reaction to the heat issues that plagued the original Xbox 360, which led to hardware failure.
Cooling technology has improved generally over the years, with Microsoft itself investing heavily in cooling and power-optimization methods for both its Xbox consoles and its Surface computers. The Xbox One S and X both have internal power supplies, which regulates power from your wall socket to your console.
In the leaked photographs of the Xbox Series X, we got a glimpse of the ports on the back of the console, and we can see a standard figure-8 style power socket similar to what's offered in the Xbox One S and X, as opposed to the 3-pin socket on the original Xbox One from 2013. We've confirmed with a few sources that the Xbox Series X does indeed have an internal power supply, as you might expect.
We'll likely have some confirmation from Microsoft sooner, rather than later, but it's fair to expect that there will be no external power supply brick with the Xbox Series X, keeping your playspace tidy.
Xbox on contract
Xbox All Access
Spread the cost
Xbox All Access gives you everything you need to get started with gaming for a monthly price, starting at $20 per month. There's also an option to upgrade to the Xbox Series X straight away at launch, as part of your payment plan.
Jump into digital
Xbox One S All-Digital Edition
Budget gaming with a price
From $160 at Amazon$180 at Walmart
The cheapest Xbox One option
Secure your Xbox One S All-Digital Edition; Microsoft's new and ambitious disc-less console. It's the cheapest Xbox One ever made, bundled with a trio of downloadable games.
Xbox One S
Cheap and cheerful
Thousands of games without breaking the bank
The Xbox One S might not be powerful enough for gaming on your 4K TV, but it sports thousands of games and 4K media for an affordable price.
Xbox One X
Monstrous power
For those who want the best-looking games
From $300 at Amazon$374 at Walmart
The Xbox One X is significantly more potent than any other console out there, providing the best-looking games built for your 4K TV.