iPhone 6s: apps greyed out after restore from another phone's backup
Waiting normally means the phone is doing something with the app store. The iPhone 6s is larger then the iPhone 5, so therefor the apps that work on a 5 probably won't work on a 6, or at least they will look a bit weird. Leave the phone connected to the internet and let it do its thing, if after a while the apps are still "Waiting" then the only other reason for this is, the apps just aren't compatible.