Neutral to underwhelmed at the moment. I believe Canon could and should have been more aggressive, but I don't think it's bad. That said, I think the price might be a bit high compared to the cameras it's coming out against.
I think they've made some good design decisions with the new platform although I'm disappointed I will likely never be able to use an RF lens on an EF-M body, if I eventually go that path.
I'm curious how the sensor stacks up to the 5D Mark IV, as far as I'm concerned they need to be doing more here than they have been, or that it looks like they're doing now. At the price point I can excuse the single SD slot, but I want to see Canon start introducing IBIS and I want to see them focus on making their sensors more competitive regarding dynamic range and shadow recovery.
Time will tell, it's extremely unlikely I'd trade my 5D Mark IV in for this. In 2-3 years, if Canon tries a bit harder and their lens lineup is going the right direction, I might say otherwise regarding a future model. I've wanted to upgrade my 17-40 4L to the 16-35 4L IS, so for RF I'd love to even see something like a 14-30 4L IS. At the same time, my 70-200 2.8L is 18 years old and unstabilized so I've been considering upgrading to a 2.8L IS II. I'd rather get the mirrorless equivalent when the time comes, if I'm on or moving to that platform. The 24-105 looks good, that's one of my mainstay lenses now, although I hope this one moves the needle on performance more than the II did versus the first gen I have.
Regardless, in presumably at least 2-3 years my next camera is probably either a mirrorless Canon, or I have to go through the hassle of changing to something else or relying on adapters to use Sony or something. They've dragged their feet long enough, I may finally move on.
I still need to see how the EVFs are though, I haven't been super in love with any I've tried to date, but I've not tried the latest crop.