Here is a quick update about upcoming Canon EF 70-200mm f/4L IS II USM Lens. According to CR, this lens will be officially announced in April, 2018, next month.
Another already confirmed lens Canon EF-M 32mm f/1.4 STM lens is rumored to be announced before Photokina 2018 in September, as well as EF 70-200mm f/2.8L IS III USM Lens.
via: CR