Yesterday it was announced on Inside Xbox that Halo: The Master Chief Collection will be coming to PC on the Microsoft Store and Steam. This is big news for the Halo community in particular, but at the same time it indicates that the mindset of only releasing Microsoft published games through the Microsoft Store on Windows 10 may have changed.
This bodes well for Age of Empires IV in that players may be able to choose which PC platform they would like to play the game. What hasn’t been announced yet is if cross-play will also be available for MCC. If Microsoft can address cross-play between Microsoft Store and Xbox, it seems like this could possibly be good news indeed for AoE IV.