Hello All -
The new scrolling gallery has a small down arrow on the lower right of it which you can click to show it as a multiple or single row of items (or an up arrow if your default is for the multi row gallery). If you can click on this to change the gallery between one scrolling row and a static multiple row of items it is the new gallery.
Yes, the new gallery has the text: "Mobile Responsive and Active Content Free" beneath it.
If you find that you have listings that still have one of the older scrolling galleries on them, please feel free to file a support case with us and provide some item numbers of active listings where this is occurring and we'll be happy to help with that.