I've heard that Xbox One application development is quite similar to Windows 8, but I haven't found much to suggest why, or what differences there are.
Is there any documentation about creating Xbox One applications (not games, apps.. like Netflix, etc), or even how to apply to obtain such information?
Important update on this topic:
Every Xbox One is now capable of going into developer mode via the Xbox Dev Mode App. Games and more importantly apps can now be developed by anyone.
FAQ on this topic: http://support.xbox.com/en-US/xbox-one/apps/developer-mode-activation-app-faq