I posted about two other lenses, the RF-S10-18mm F4.5-6.3 IS STM, the RF200-800mm F6.3-9 IS USM, and the last is the RF-24-105mm F2.9L IS USM Z.

The RF 24-105mm F2.8 is a new option. I've used the older EF-mount 24-105 f4 L lens, and it was a great walkaround lens. This new one is a bit larger and heavier, since there is no physical zoom (the lens is self-contained with internal zoom, so it won't get longer/shorter when you're zooming), much like the old EF 70-200mm F2.8 L lens. The new F2.8 version allows for consistent f/2.8 aperture throughout the zoom range.

Here's what the article says:

Still and video professionals who want a single lens that can handle most tasks with low-light capabilities will find what they’re looking for with the RF24-105mm F2.8 L IS USM Z. This is the world’s first 24-105mm focal length lens combined with consistent f/2.8 maximum aperture,1 offering true portrait-length telephoto coverage resulting in sharp images. High-end photographers, photojournalists, and video content creators can utilize this lens’ other features that include:

• Constant overall length when zooming.
• Manual aperture ring for video use.
• Optimized optics for high-level video.
• Image stabilization.

A new Power Zoom Adapter will also be available for the RF24-105mm F2.8 L IS USM Z lens, an optional accessory for super-smooth zooming during video operation. This detachable device allows for more natural movement when zooming in and out, and easier control for solo camera operators. A standard version of the Power Zoom Adapter will be available, as well as a 20-pin port version to support zoom and focus demands. The firmware updates that will be available in early December for the EOS C70 and EOS R5 C cameras will add support for the RF24-105mm F2.8 L IS USM Z lens.