I am starting this thread in the hopes that those with more correct information than what has been shared to date will chime in and educate us. I have seen a number of posters allege that the reason the new 2016 Macbook cannot do more than 4k30Hz is because it has USB 3.1 Gen 1 (as opposed to Gen 2) and that, because Gen 1 is limited to 5Gbps, it cannot carry anything more than 4k30Hz. That is wrong. USB 3.1 Gen 1 is a protocol for transferring data. But when you connect a monitor to the rMB through the USB C port, you are not transferring data using the USB protocol. You are transferring data using the DisplayPort protocol using what is known as USB Alternate Mode. In fact, I think 4k30Hz is already 8+Gbps. Somebody please correct me if I've messed all this up. But if I haven't, then I think the question of whether future software can enable 4k60Hz output on the new 2016 rMB is a valid question that cannot be easily dismissed by simply pointing at USB bandwidth limitations.