This is a great camera which gives the 80D a nice iterative update. Plenty of people will get excellent results with it.
It's going to be a solid seller with youtubers and creatives, and will handle some of the price-conscious wildlife market.
Main Pros:
1) 10 FPS
2) 32 Mpx
3) 120fps in 1080p
4) 4K
5) Joystick!
However... if you can wait, you probably should. Here's why:
1) No IBIS. This is a breakthrough technology whose time has come, and its very unfortunate Canon didn't include it. IBIS is NOT a pro feature! Pros mostly don't care. IBIS helps amateurs/enthusiasts, who are less likely to have full mastery of the camera dynamics, and are more likely to get blurrier photos, get frustrated, stop buying lenses and go back to their digitally stabilized cell phones. Yes, IBIS helps everyone, but the ones who benefit most are amateurs, a market Canon needs. This was a lost opportunity.
2) Face detect and other AI-assisted tracking tech. Canon is well behind on eye/subject tracking, and the company doesn't have a great track record of continuously updating products after they're released. There's a decent chance the baked-in eye tracking in the 90D won't get an update (but maybe it will - we just don't know with Canon). If you can wait a couple of years for Canon to catch up in this area, you should wait.
3) *Gulp... the R is already getting some pretty serious discounts, putting it within around $300 of the 90D's likely price range, and refurb units might be less. Especially with the holiday season coming, it may be worthwhile to wait and see if you can pick up the R with an adapter.