I did the update, everything went smoothly. I didn’t deployed yet in store but tested on my (real) iPhone 6 and everything looks OK inclusive seeing logs like “Push Plugin register success:…” or “WARN: (getRootNav) is deprecated” in the console of Xcode.
Note: I had to update ios-deploy too. I was using version 1.9.0, first build with cordova-ios@4.5.0 noticed me that I had to update to 1.9.2, which I did.