Aren't they doing this in Windows Phone 8? Boy, I'm disappointed if they don't. Since they are implementing offline maps, having one mapa data for Nokia Maps and another for Nokia Drive doesn't make any sense. In Lumia 920 and 820 publicity pictures we can see Nokia Drive tile pinned but not Nokia Maps, I thought it was replacing Maps and Commute all in one app. Nokia still uses old Skydrive tile so who knows.
About the updates, I don't like to mention other OS but Android recently implemented Smart App Updates (marketing name for Delta Update) which ensure that only the parts of an application that have changed will be downloaded when you next update it, saving on time, bandwidth, and battery when updating apps, I hope MSFT has something similar to WP8.