The Italian booking agency Indipendiente have on their twitter and facebook announced Arcade Fire are coming to Italy. The city and date will soon be announced. My Italian is non-existent, but it could be the band will play in Bologna on September 2nd.
From what I gather though that specific date/city is far from a certain at this point.
Was just informed it's very very likely that Arcade Fire are indeed playing in Bologna, Italy on September 2nd.