Check this article periodically for Marketo Product updates that impact Product Docs.
Q4 - 2018
As of October 5, 2018, Sales Engage no longer has a Command Center section in the tree:
The Command Center tab itself remains.
As of the Fall '18 Release, the following Web Personalization features are no longer available:
When creating web segments, you are no longer able to define your segment by specific visits.
In the Web Campaign editor, you are no longer able to select notify (via email) as an option.