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It would have to be a villain the Turtles haven't met hence the unknown.
The only characters we know are coming that have not been introduced to the turtles as of yet are Bishop, Armaggon, and the Triceratons.
Bishop's character sounds like he would be different from his 2k3 origin. That is if the book can be believed.
We know Zog is appearing in the following episode so Triceraton's are possible.
And Armaggon is a bounty hunter with a taste for Turtle so it's also possible. But it's also possible that the person also can be a complete surprise that we never saw coming.
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