So here's my experience in Guangzhou:
Surprisingly easy to get in - didn't encounter any codes to scan, checkpoints, or tracking. Seems this has lightened up on the highways at least. I rode in with a private driver - as public transit doesn't connect to Guangzhou. I expect it would have been much more difficult to travel had I used public transit.
In the city itself, every single person was wearing a mask. Maybe saw two people without one. A couple people had their masks down for smoking cigarettes, though - but at least that's still filtered.
I noticed the air was definitely clearer than the last time I was in Guangzhou. That was a couple years ago though, and it rained a lot recently, so that could be 100% confirmation bias.
Hotels were incredibly strict. My reservation was cancelled upon me arriving (despite knowing I was a foreigner before I arrived in the city...) and a few other hotels shuffled me away without letting me talk. Apparently there are stricter guidelines about which hotels can accept foreigners - I was given a list of 3 in the district (all 3km from where I was) and all three were full or refused service for me. Found one that wasn't on the list that would let me in - took about 30 minutes of paperwork when I arrived. Basically just confirming I hadn't travelled abroad, hadn't been to Wuhan, and didn't have any symptoms. Inconvenient, but not impossible by any means. Had I arrived in the city very late, it might have been an issue. This isn't entirely new - some hotels don't have a license to register foreigners, so they can't even accept them. I've run into that a few times while travelling - mostly in touristy places popular with Chinese but not popular with foreigners - but never in a big city.
I talked with a guy from Shenzhen for a bit - it took him two hours to find parking and also had to fill out similar forms to what I had to - so a lot of these precautions are also applied to Chinese people. Fun note: his friends had also assumed that the US calling its citizens back was going to be the start of the great Sino-American war. Must be a common WeChat conspiracy theory.
The only real issue I had was getting out of Guangzhou. Again, looking for a hired driver (similar to Uber, I guess) I was refused service a few times because "the other passengers wouldn't be comfortable with that." One dickhead went so far as to say that even a driver from Wuhan wouldn't take a foreigner in his car. To prove him wrong, the next driver I contacted picked me up and just double checked that I'd been here a while. He told the other passengers that we picked up that it wasn't an issue and was a real nice dude.
Things honestly seem to be getting back to normal - shops were mostly open, but some with some different policies (small convenience shops just had their staff sitting by the door, you tell them what you want and they'd fetch it for you.) A lot of gyms had shut down, but there were also two gyms on every block, so that could be unrelated. The city was pretty alive still - joggers in the park, business people shuffling around, and cafes pumping out the smell of coffee. Light at the end of the tunnel, maybe, if there aren't any huge outbreaks, we should be back to normal in a month, I'd think. Wuhan has lifted its quarantine, and I think the Wuhanese are probably facing much more discrimination than foreigners are at this point.