The other big news from the R5 announcement

Is that I was totally wrong

Okay, let's get this over with.  I was wrong.  I'm happy I was wrong.  Delighted even.

One thing that Canon slipped into the website I found very interesting as according to Canon, they announced that RF and EF lenses would benefit from IBIS + IS technology.

Canon’s first camera to incorporate 5-axis IBIS (In-Body Image Stabilization), the EOS R5 will not only enhance the ability to shoot still images at slower shutter speeds but it will also help reduce camera shake when shooting movies. Additionally, the EOS R5’s IBIS will work in combination with Optical Image Stabilization found in many Canon RF and EF lenses.

Now with this, I'm assuming that they are meaning that IBIS will work in combination with IS in RF and EF lenses, even though it could be taken that they are simply meaning it works with IS that happens to be found in both RF and EF lenses.  You can take that statement either way.

If EF image-stabilized lenses will work with IBIS, then this is well, huge.

I felt given the level of complexity between the lens and camera that it wouldn't work. All their patent information seemed to state it wouldn't as well. 

This means that yes, EOS-M can get IBIS+IS and so can the DSLR's if Canon wanted to go down that crazy route.  It means that even with the slow communication protocol that Canon can still get IBIS to function with legacy IS lenses.

Major kudos to Canon.  While some may say, so what? Everyone else has that - Yes, but their electronic mounts were not developed when 12.8K baud modems were popular.  Yes, that's 12800 bits per second.  At the time, the EF mount was a high speed communications protocol, I believe around 50K bits per second.  Which was amazingly fast for the time.   I remember living large when I got a 56K baud modem  I wouldn't ever need anything faster than that ;)

Also and this is important, the EF protocol can apparently switch up to 500K bits / second with newer lenses.

Now, of course, that is all ancient technology.

As far as I know, there's very little IS information that gets sent back from the lens, so while IBIS+IS may work, I'm curious it works as well as it will with RF lenses.

If you are curious, Marcan did a deep dive into the EF protocol here.

I think there may be a lot of asterisks around IBIS and the support of various lenses.  What I will be interested in is their support for third party lenses.  Can you enter the focal length manually and have IBIS properly work with lenses that are not chipped such as manual focus and manual aperture lenses?  Will it work with "native" RF mount third party lenses?

So there are still many questions, but the tidbit that Canon USA did share is quite exciting.

So what we now know about the stills photography side of the camera;

• 44.7MP
• 12 fps mechanical / 20 fps electronic (AF tracking up to 20 fps)
• Canon's first advanced mirrorless AF - Human, Dog, Cat, Bird (body, head, and eye AF.)
• Dual Card Slots
• IBIS with IBIS+IS enabling up to 8 stops of effective stabilization works for both RF and EF lenses.
• image.Canon integration

From even the stills side, it's a very impressive camera.