From tomorrow at 9:00 pm, the Xbox Countdown end of year promotion will be available, which will allow you to have discounts on a large Xbox One and Xbox 360 list until January 5.
As per tradition, the promotion will consist of both daily and weekly offers. The weekly will have two refreshes, while the daily ones will be updated daily until December 31st.
A list of games with price cut has been shared on ResetEra but has no official confirmation for the time being, and does not include native Xbox 360 products.