Compared to the slow uptake of desktop applications, mobile users update very fast, due to store management and notifications. This is what I noticed looking to the migration rate data of my mobile app. True, this is a single data point, and not a statistical analysis, but I'd expect this to be rather standard.

The graph below (for My Mini Figures Android app) shows the current users for each of the versions of the application. The green area is the update to the new release. As you can see, out of the almost 30,000 active users (users with the app installed) after a week of the release of an update, about 25,000 moved to the new version. That is an impressive rate to me, clearly showing how different this world is form the classic desktop one.