Almost all of these updates were made some time ago, but I feel that an official post was needed. CertifiedOnDemand.com is updated for Winter 17 – please post if I’ve missed anything. Thanks!!
Big updates to Lightning Experience; resources updated: http://classic.certifiedondemand.com/user-interface/
Customizable campaign influence objective and resources added: http://classic.certifiedondemand.com/sales-cloud/
Stay in Touch feature removed- slated for retirement in Summer 17: http://classic.certifiedondemand.com/sales-cloud/
Import accounts & contacts wizard retired: http://classic.certifiedondemand.com/importing-manipulating-salesforce-data
Chatter Answers and Chatter Messenger slated for retirement: http://classic.certifiedondemand.com/salesforce-com-certified-administrator-chatter/
Reusable processes added: http://classic.certifiedondemand.com/workflow/