No such announcement has been made for North America, but we can safely assume that the EU outage will coincide with network interruption here. Besides, the only "preparation" you have to do for such an event is not make ironclad plans to play online games or buy things from the PlayStation Store right then. If it turns out that the network doesn't go offline, just sign in and play extemporaneously.
It's not going to adversely affect your life too much if this outage turns out to be EU-only, is what we're saying.
