This character may look like Sabrina, however Thomas says “new characters” so it is unlikely that this is actually Sabrina. That being said, we still learn a lot from this image. One thing we learn is there is someone (an akumatized victim?) who has some sort of ice power or ability. This means that we will most likely see Ladybug and Chat Noir’s Ice Abilities! Their abilities have been underused so I am excited for this! Another thing I want to point out is “a batch of new characters”. Usually if you are making a large project, you finish the more important things first. And if this character posted here is a main (or more main then side characters) then that means that the other “new characters” must be pretty important as well. It is very possible that we will see a new hero in this special episode!