Well you will be waiting years for it then because they just updated the GPU inside in the 2015 model. The previous one had a Nvidia 750M which was 3 generations behind so it was released at least 3-4 years ago.
I don't understand why people need the last model of macbook even if they had at least a 2012 model.
The 2012 it's more than enough to do everything. Why to waste money on 10% more performance?