Hi-
The feature has been made available as preview feature, see the post below.
http://blogs.msdn.com/b/crm/archive/2016/01/12/preview-feature-voice-of-the-customer-surveys.aspx
https://www.microsoft.com/en-us/dynamics/crm-customer-center/get-feedback-with-voice-of-the-customer-surveys.aspx
Hope this helps!
BShastriCRM