Mailchimp integration will be a new feature for version 12.0. MailChimp helps you design email newsletters, share them on social networks, integrate with services you already use, and track your results. It's like your own personal publishing platform.
The integration with PHP Point Of Sale will be customer, employee, and supplier list management. From each of these modules, you will be able to select a person and choose the lists to subscribe them to.
It is really simple to setup; you will simply enter a mailchimp api key from the store configuration page, and it is instantly available. If you already have people in PHP Point Of Sale that are in mailchimp, this will be automatically detected.
I hope this feature will be helpful to many small businesses. Please let me know your thoughts.