I ordered the 7 pin wiring kit from Hyundai (in Canada) it it came in about 4 days. Part number S8F67 AC800. It was $200 plus tax just for the part. I just finished installing it. So the 2023
is prewired for the hitch with a 8 pin connector, that looks just like the one on previous years, but it's in a different spot. You have to remove the trunk tray and then look under the driver side luggage panel. You have to connect the wiring harness to that, then cut a hole in the grommet to send the trailer hitch wire down to where the hitch is. You also have to wire up a little control module and ground it. It was all way easier than I thought. The liner came out easy and the panels all popped off without much fuss. The instructions that come with it are really good. The kit also comes with a harness that installs in the dash by the fuse panel for a brake controller. I don't have one though so I didn't install that.
This is what it looks like with the trunk tray removed (right is front of vehicle). The grommet is in the top right. You can see where I cut it to run the wire through it. You can also see the corner of the white pre-wiring harness to the right of it. Not sure why they hid it there, it would be way easier to access if it was just left in that panel underneath the car. The control module is on the left.
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The kit didn't use the wiring harness that is located tucked up under the bumper, so I'm still not sure what that is for. See below.
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