[Interest] Minimum work needed to update bundle for Apple App Store?

[Jason H]

Recently, Apple started requiring a 167x167px icon for iPad Pro.
I added the entry to the Info.plist,  but was unsure of what to do. 
Will the icon be included in the bundle just from from the plist change?
Will I have to rebuild the app?
Will it only update when the .xcodeproj is rebuilt, and if so, how do I regenerate that?

It took me a few tries to get it included, that's why I'm asking.

Thanks.