Apple announced a new design in connection ports on a future Macbook models. There is gonna be a single (USB-C type) connector that is gonna be used for charging, data transfer and video out, instead of the previous model where different ports was used for the different applications.
With this design, Apple release appropriate accessories that need to be bayed additionally from the Apple Store.
From one point of view, this design is very simple and elegant, but if you think a scenarios that you need to charge the laptop and in the same time transfer data from you usb drive or vice versa, or you need video out, you will come to a problem.
How Apple will deal this problem, maybe the gonna make a new additional accessories that will deal with it, the time will tell.