JD just confirmed this during the Ryan Dempster Press Conference.

Ugh.

That is really gonna hurt his development. Who knows if the Rangers will every see him as a potential ace pitcher again. Sad news for Rangers and Feliz. I thought he was pitching pretty well this season. Hope they give him another shot in the rotation

TJ isnt what it used to be. Lots of pitchers have it and come back just fine. It does make you worry about the durability of his arm as a starting pitcher though