This post features quite a few leaks, from Episodes 23 and 24.
The first spoiler is a villain called Penalty (Chloe again). Akuma is in glasses and her weapon is a whistle.
Another spoiler is the Cat Walker model from the Kuro Neko episode. Is it Adrien or Felix?
The last spoiler is Joanna d'Arc - previous owner of ladybug miraculous.
Source : Artstation