It was only October when the Canon RF 70-200mm f/2.8L IS USM lens went up for pre-order, and they only started shipping a month or two ago. But already, they seem to be working on a new one, according to a patent uncovered by Canon News.
The current model RF 70-200mm f/2.8L IS USM is like many zoom lenses. When you spin the focal length dial one way, the lens gets longer and when you spin it the other way it gets shorter. This new patent shows a design that would allow it to remain the same length throughout the zoom range. They also show off designs for an f/4 version, too.