As much as I love the EOS R5, this EOS R3 is the body I've been waiting for!
BATTERY LIFE
My original thoughts when the EOS R was announced were about battery life. I was a little surprised that Canon kept the same batteries for the EOS R as the 5D Mk4, but could also understand why because it made the transition easier for those who didn't want to buy a bunch of new batteries while gradually transitioning to mirrorless.
Similar to when the EOS R5 and R6 were announced. Canon did provide a slightly (14%) higher capacity battery to help soothe the battery life complaints, but those moving from the 5D Mk4 could still swap batteries back and forth and didn't need to purchase new batteries.
Assuming the EOS R3 uses a battery similar to the 1D-series, there's also the potential for more powerful autofocus (the 1Dx-series LP-E19 batteries are 10.8V-2700mAH, compared to the new LP-E6NH at 7.2V-2130mAH).
I hope this R3 body has dual processors like the 1D-series and 7D Mk2, and dual processors will suck even more power and could also benefit from better batteries.
THE FRONT BUTTONS
...you know, the buttons that SONY doesn't have.

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© Jared5 [SHARE LINK] THIS IS A LOW QUALITY PREVIEW. Please log in to see the good quality stuff. Although I've never owned a 1D-series body (borrowed a couple over the years and loved them) the ability to configure the front DOF button on the 5D Mk4 and 7D Mk2 was one of my favorite features and I really missed that when moving to the EOS R. In fact I was almost jealous of Nikon users who got two front buttons on the Z6 and Z7.
When the EOS R5 was announced I was happy to see the DOF button return and couldn't wait to configure it the way I did with the 5D Mk4, but unfortunately someone at Canon didn't check that all features were being retained from the 5D Mk4 (like customizable Q-menu, but don't get me started on that).
Seeing those 4 beautiful front buttons just makes me happy thinking about all the possible configuration options, but better yet I'll be able to find them just as easily when shooting in portrait mode. Now I only hope to be able to configure them the way I want to.
Looking at this body it's clearly designed to be a photographer's camera more than a videographer's camera (not that it won't have really great video specs, because that's expected if Canon is to compete with Sony).
OTHER STUFFI hope to see NFC and GPS return because I used both on the 5D Mk4. Sure, someone will say "but you can pair it with your phone to get GPS" but I say "how do you effectively do this when shooting with
two bodies?"
As much as I love the
ability to do things by connecting to my smartphone, I don't like the
dependency of it. Make something work great as a standalone product
first (even with a dedicated remote) and
then add all the stuff that will tie up your main source of communication.
I mentioned this on the EOS R5 thread: if you're expected to power the camera off when not actively shooting (as Canon recommends) then you'll need to reconnect WiFi each time you power on again. Having NFC on the 5D Mk4 made connecting to WiFi really easy, just tap my phone to the side of the body and it starts connecting.
Given the price point of the EOS R it was understandable why they didn't include NFC, but I was really disappointed to see it missing on the EOS R5.
Please allow us to write everything to both cards!I'm guessing here, but if this R3 body has dual CFx cards then maybe Canon will
finally allow us to record
video to both cards. I care way more about
complete redundancy than I care about 8k video.
If they do this with video then Canon will
hopefully finally fix the fact that the
RATE button only applies to one card. That's much easier to fix than recording video to both cards but I've been waiting for that fix since the 5D Mk3.
We can record
audio notes (R5 only, sorry R6 owners) but only to the primary card, so maybe they'll finally allow true redundancy and duplicate everything on both cards.
Resolution isn't a deal breaker for me as long as I have at least 40MP, which seems likely if Canon wants to stay equal to or ahead of Sony. Because this looks like a photographer's camera, maybe Canon will go all out and increase the resolution beyond the 45MP of the EOS R5.
Glad I found this thread because I'm going to jump on the R3 bandwagon as soon as the body is available. I might be eating Mac & Cheese or Top Ramen for a while as I save up, but it will be worth it!