Apple unveiled fourth generation 13-and 15-inch MacBook Pro models during a press event at their headquarters on October 27, 2016. The models introduced the Touch Bar, a multi-touch enabled OLED strip built into the top of the keyboard in place of the function keys. They include a sapphire-glass covered Touch ID sensor at the right end of the Touch Bar which doubles as a power button. The models also introduce a "second-generation" butterfly mechanism keyboard that provided more travel than the first iteration implemented on the Retina MacBook. The 13-inch model has a trackpad that is 46 % larger than its predecessor while the 15-inch model has a trackpad twice as large as the prior generation.

Answer this question based on the passage: when was the most recent macbook pro released? Okie... think carefully first, then make a decision:
This is the relevant information: Apple unveiled fourth generation 13-and 15-inch MacBook Pro models during a press event at their headquarters on October 27, 2016. So, the answer is October 27 , 2016.