At the end of 2016, the TurnItIn app will no longer be available in Canvas. That means when you make an assignment in Canvas, you will no longer see the option to get a TurnItIn report on student submissions. If you want a TurnItIn report, you will need to use the "external tool" option and create an assignment using the full TurnItIn LTI.
You will want to consider how you want to prepare for Spring 2017. All assignments that currently use the Turnitin app will need to be recreated using the LTI.