There are new terminal assignments effective Aug. 7, described as temporary, and Air Canada now checks in at T5:
http://www.adr.it/documents/10157/55...3-513dfd5306aa. Also now all Schengen arrivals exit and have baggage claim at T1, so if you're coming from a Schengen country it gets difficult. Not sure if the bus to T5 stops at T1; otherwise you need to wait for the bus in front of T3.