I betcha that CX can't wait for the new B773-ERs to arrive!
Once they do, the A346s will be deployed to the YYZ route. The A346s were the first to come off the Airbus line, hence the many problems associated with it.
The A346s were never meant to make such a long route. The A345s are. But CX ordered the former from ILFC instead of the A345s.