Update: The Xbox One HBO Go app has arrived, as Microsoft reveals on Xbox Wire.
They also released that video that leaked earlier this week, so we've embedded it below.
original story follows…
On top of that Polygon uncovered a YouTube ad for HBO Go on Xbox One that's since been set to private, while a Microsoft spokesperson called the Xbox 360 tile a "programming error" and said the company has nothing to share at this time.
HBO Go launched on PS3 in March, and although the Xbox One and PS4 versions are definitely coming at some point, it's been some time since we heard anything official.
Both apps are supposed to launch before 2015, and they had better - if they don't want to be immediately eclipsed by whatever standalone HBO service the cable company announces next year, anyway.
Update: Here's that video: