Consoles are more than systems to run games, are multimedia hubs for different services. The intention is to bond users around a unique device. Microsoft defined Xbox One as the final multimedia system and for that purpose, a machine like that needs Apps.
In that vein, HBO Go could arrive to Xbox One. HBO Go is a user on demand platform that gives access to premium cable movies and TV shows from HBO. This application is already available on Xbox 360, therefore, it was a matter of time to be on Xbox One too.
The following pictures show the HBO Go App running on Xbox One: