Can you not just plug into iTunes and install it through that? I believe that's how I did it and it didn't need 5GB free then. I think there's a lot more than j

Can you not just plug into iTunes and install it through that? I believe that's how I did it and it didn't need 5GB free then. I think there's a lot more than just messaging and HealthKit. Keyboards are a huge update. Extensions, which are already available in lots of apps, are going to make your device a lot more useful. Most of the big things were for developers so you will see the biggest things in apps, not the OS IMO. Another reason I would update is that it won't take long before a lot of devs drop iOS 7 support. There are tons of new APIs in iOS 8, coupled with the fact that it'll probably hit over 80% install base in a couple of months that it's best for the small devs to just drop older OS support. It happened with iOS 7.