Yes, that’s basically just a loading placeholder and will also show if the Super Tile doesn’t exist anymore… though we perhaps consider having a separate loading indicator.
You can alternate which icon is shown, but you can’t currently style the individual items within a super tile. Some people have chosen to upload their own icons and use those for the different states. For example, a generic top-down view of a lamp that’s off and another top-down view of a lamp that is glowing.
There’s a feature request for styling the individual parts of a Super Tile that you might want to cast a vote on and comment with your use-case to bump the thread here: