I assume all GFWL games will be shut down. RIP Dark Souls.
Games for Windows Live will be discontinued on July 1, 2014. Although it is available through Steam, Age of Empires Online requires features of the Games for Windows Live service. You can continue to enjoy all the features of Age of Empires Online as the service will remain 100% operational until July 1, 2014 when the server will shut down. Please visit the Age of Empires Online forums for additional details.