Redditor JBurton90 posted the above image to the online discussion hub last night. It appears to depict Xbox One game Max: The Curse of Brotherhood, only the cutesy platformer bears the words "Free Play Day With Gold" in place of a price tag. Nearby, Crimson Dragon and Strike Suit Zero: Director's Cut are also listed as "free" for Xbox Live Gold subscribers owing to the ongoing and well-known Games With Gold promotion - the same promotion that offered Max: The Curse of Brotherhood to Gold subscribers at no charge just last month.
Though it's unclear exactly what the Free Play Day promotion entails or when it will officially launch for members of the general public, it seems pretty self-explanatory. Presumably, Xbox Live Gold members will be granted one day to play games available as digital downloads through the Xbox Live Marketplace at no charge. Microsoft has yet to officially acknowledge the promotion, though a recent tweet from Xbox Support confirms the validity of this report and claims that the company will offer more information shortly.
Update: A Microsoft spokesperson told Game Informer, "A promotional tile for Max: Curse of the Brotherhood was posted briefly on the US dash in error yesterday. We apologize for any inconvenience. We're constantly exploring different ways to offer more benefits to our Xbox Live Gold members and will keep them updated when special offers become available."