I'm not sure that is a fair comparison, Movies have a very strict number of people who can see the movie the first weekend (seats in movie theaters and not opening around the world, though the highest movie in the list was harry potter which I think had "world premier"). Where games have no limit on how many can buy it the first day, which is especially true since digital download has become so popular.
A full version of Windows 8 Pro and backup partition of the same (which, from what I understand, you can put on an external drive and have an extra ~20GB)
Not really, I think that WP will have a bigger userbase than RIM and I think that a better to compare against Android. I also assume that "phoneapps" will work on desktop/tablet windows 8 as well... But again, this is just my thoughts.
There is on the android version, there's an option "Make available offline" you just draw out a square of what part of the world you want offline. Not sure if it's available on the iOS version though.
Unless you want to have the phone attached to the bike, I haven't found any good mounts for my galaxy nexus, but there's plenty of mounts for iPhone. I've considered a switch just because of that.