Microsoft teased that Windows 8 apps would work on the Xbox One, and has implied that at some point there will be cross-platform gaming between the Xbox One and Windows 8 machines. Nothing has ever been confirmed, but it looks like Dell might have accidentally confirmed that Windows 8 apps will indeed run on the Xbox One, at least "all your favorite Windows 8 apps" will run and sync to your Xbox One.
The question is in how those apps will be controlled. Using a gaming controller can be extremely annoying for TV app input, which is why Microsoft has been pushing its SmartGlass mobile app, so your tablet or phone can act as a second screen (and most importantly, a screen with a quality keyboard).
We assume there will be more Kinect input, but it would make sense for Microsoft to offer a way to control Windows 8 apps on the Xbox One with a phone or tablet. We'll have to wait on that info as it will likely come with the official Xbone release next month.
source: Dell via Neowin