Not sure why people are surprised when we've already seen stylized art of fem hroths in-game during the Bozja questline and they looked similar.

The thing is though, is that they will not be getting a muscle slider so you shouldn't hold your breath for it. Every race that has an ear or tail slider does not have a muscle slider. The only races that get muscle sliders are hyur and roegadyn. Neither of which have customizable ears or tails. That said, I think it's likely they will have permanent high muscle tone like the viera.