In a recent update, supposedly last week, Sonic has acquired a batch of familiar upgrades: the Fire Shield, the Aqua Shield, the Lightning Shield, and even the Insta-Shield. Imagine the usefulness of a Fire Shield in Marble Zone or an Aqua Shield in Labyrinth Zone... this is quite the treat. The image below was not taken in Debug Mode.
As we know, all four of these shields officially debuted in Sonic the Hedgehog 3. Could this be a hint toward the hungrily expected Sonic 3 Remastered?
UPDATE: After a bit of perusing, I am unable to find any elemental shields aside from this one instance. However, the Insta-Shield does exist in-game.
UPDATE 2: Snuffles is right to an extent. It was an accident, however, and I didn't realize it until now.