Here are a couple of leaked images of the previously rumored Canon EF 16-35mm f/4L IS and EF-S 10-18mm f/4.5-5.6 IS STM lenses. Expect an official announcement later tonight or tomorrow.
The 16-35mm f/4L appears to be slightly larger than the popular Canon 17-40mm f/4L lens. The 10-18mm may end up being less expensive than we initially though because of the move to a plastic mount (as compared to the metal mount of the EF-S 10-22mm lens). It looks like a very lightweight and compact lens.