In the latest XboxEra podcast, guest Nick Baker said that he learned from his sources that Microsoft's roadmap for future games has been planned for the next 10~15 years because they have plenty of resources at their disposal.
Usually, game manufacturers plan for the future in about 5 to 10 years, and Microsoft takes it a step further. And this is also related to the fact that after Microsoft's successful acquisition of Activision Blizzard, the number of studios under its umbrella reached 47.