A new player model may actually be releasing in a future model. These new models are going to be showing off a much thinner looking character textures.
The model was released on Twitter from Minecraft developer Jens Bergensten. Jens posted the picture stating that the model was a possibility in the future of Minecraft. While it’s not a drastic chance, you can see that the arms for the new model is three pixels wide giving a total of one pixel thinner.