According to the Egami Blog, Canon has filed a patent for a CN-E 70-200mm f/2.8 lens for APS-C and Super 35mm sensor format cameras. Note that the lens will likely be marketed as a T2.8 lens to match their CN-E 15.5-47mm and 30-105mm lenses with the same image circle.
Description of the patent literature
Patent Publication No. 2015-230449