Chosen Solution
The new Apple MacBook Pro 13,3" Retina 2016 with Touch bar is sold with a max 1 TB SSD. Is it possible to replace it with a 2 TB SSD?
Sorry not possible ;-{ Unlike previous models which had replaceable SSD units, Apple now solders down the discreet flash chips to the logic board. And no, you can’t alter them as there is no alternative chip that has larger capacity as Apple is using densest available part now. Your only option is to use an external USB-C drive.