we want to publish an update of our app. Is it possible to rename the app after the update? let's say the app is called myApp and I want it to be called myApp 2 after the update... can it be done?
Actually you can. You can change the "Bundle Name" which (I think) is the name the App appears on the AppStore and the "Bundle Display Name" which is the name that appears under your icon on the Home screen. But if you change your "Bundle Identifier" then your App is not the same App. More info can be found in the Apple Docs here.