Our certs expired on our 1.1 appliance.
Followed tid 7016720, this is missing one more piece of information - When you login to imanager after the update and select a printer or manager you will be requested to allow the new certificates. (tid seems to stop in mid flow)
I have also noted that our self signed certs on the appliance web interface (not imanager) are still showing the old expiration date (2015-07-18). Should this concern me as everything seems to be working ok.