I tried to submit my app with the latest build of Titanium.
When Xcode validate the app before it sends it to the App Store it gives me a warning :
"The app references non-public selectors in Payload/My App.app/My App: push:"
I use Push in my app with the Ti.Network.registerForPushNotifications method.
You can see the implementation in the attachments.
Apple is very strict with this kind of warning, and I think the app will be rejected at review.