There's lots of rumours that a Triceratops mummy is going to be described (but yes, they're only rumours. Apparrently, it shows that Triceratops had crocodilian like scales, osteoderms on the back, and weird bumps on the tail, which possibly could've anchored quills.
The skin was also laser-scanned and used to texture the models in Dinosaur Revolution.
The things on the back aren't osteoderms, just broad scales (osteoderms by definition are bon armor embedded in the skin).