It appears that Canon is planning a digital display on their future lens designs. We could likely see how this works on the replacement for the 70-300mm f4 – 5.6 IS lens. The display will be similar to what is there on the Zeiss Batis lenses. The Zeiss Batis lenses (both the 25mm f/2 and the 85mm f/1.8) were pioneers in this regard as the first lenses to feature a digital display on the barrel.
The exact type and nature of information that you are going to see on the Canon lens is not yet clear. Having said that, you could hope to see information like the exact distance you are focusing at on the lens barrel just like the Zeiss Batis lenses. This lens is also likely going to have Nano USM auto-focusing motor on them.