Gmail promotions tab improves for marketers

The official Gmail blog announced today that they’re testing a new way of displaying emails in the Promotions tab. This display method will show users a featured image instead of the normal subject line.
Email marketers that want to take advantage of this should visit the Gmail developers pages for information on how to set a featured image for Gmail.
More innovation from Gmail in the mailbox. This one feels pretty consumer friendly, although I still have memories of XXX spam from years ago showing rather explicit images. Gmail must have a lot of confidence in their filtering to push image display to the inbox.