Below the six new icons is the familiar Pre-formatted string that you would copy and paste into a post to display the image.
Just below that is a new button for more strings.
More Link strings
Clicking that will show some other convenient pre-formed strings
Linked Thumbnail will give the string to copy and paste into a post, but this one will display a hot-linked thumbnail instead of the full-sized image. Useful for tech posts with lots of detailed pictures
Medium Image is just another chance to get the string for a post, in the lower size of a picture, if two sizes are available.
HTML code gives the string that you would use to imbed the picture link into you own web page