So there was a picture going around with Ladybug with short hair and a blond hair guy possibly Chat Noir as Snake Jaguar.
My theory is that since we will be seeing them grown up that it is Marinette and Adrien not Sabine and Tom. Tom doesn't have blond hair so it couldn't be him.
We'll probably see them grown up because of akuma not because of a portal. The blast of the akuma could change them to what they look like when they're older and give us some hints about later episodes.
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Miraculous Ladybug Theories
Genel KurguThis is a book where I write my theories and reviews on/about the show Miraculous tales of Ladybug and Chat Noir