The amount of products shown should called by the url like http://www.mystore.com/newsletter.php?qty=10, and the page will display the 10 most recent added products. This page should not be implemented into OC in any way, just a independent php page which pulls the needed info from OC.
The design should be responsive and display well in all major email clients ,webmail sites and mobile view. Of course all urls will have to be absolute.
This is the format I am looking for. I've used random colors here, but you'll get my store url so you can make the design match