Foley expects Arcadia will be delivered after Windows 10, so official statements about the service aren't expected at Microsoft's consumer-focused Windows 10 features event on January 21, 2015.
One of my sources says that Microsoft officials considered using Arcadia to allow users to stream Android apps and games on their Windows devices. As we've known for a while, Microsoft's Operating Systems Group has been mulling the wisdom of enabling Android apps to run on Windows devices and phones in an attempt to eliminate the app gap between Windows and other mobile platforms. But my source says that Android-app -streaming idea has been tabled -- though the idea of running Android apps in some way on Windows devices is still not dead.