Going from CRM 4.0 to 2016

Hello,

I have a customer that is upgrading from 4.0 (on prem) to 2016 (online). 

They have asked me what are the main feature upgrades that they should be aware of in 2016 (over 4.0). 

All I can think of is the following....

1. Business Process Flows

2. Universal Search

3. Advanced Find

4. The Social Pane

5. Dashboards

Am I missing anything??