Twilight Lexicon gives us a translation of an
announcement denying that New Moon will be shooting in Montepulciano from May 25 - 30:
Just want to you to know that the Eagle Picture’s Official Twilight WebSite (the Italian Distributor) today indicated that they talked with the Municipality of Montepulciano, which denied the rumor that New Moon would be shot in town during the period from 25th to 30th of May. (They denied the timeframe, not the fact that Montepulciano will host the shooting).
P.S. Maybe they're just trying to throw us off so that crazy fangirls won't stampede their peaceful town. ;-)