I completed reviewing the results of a text-compare tool and below are all the feature differences it found between the 2023 vs 2022 RDX.

New to 23 RDX:
- Opening "right to update software" section references a touchscreen, but it is not mentioned elsewhere (maybe in the Nav manual)
- References to a PMC edition have been removed
- Will autolock doors if you walk away after rear tailgate starts closing, 22 was after it finishes closing
- List of Alexa builtin capabilities change (eg: adds weather/questions/smarthome, removes navigation), don't know if that is server controlled and also are upgraded on 22
- Upon crash, Acuralink will call E911 instead of an Acuralink operator
- Need to press brake pedal + power button to turn off the engine, 22 was power button only
- calls the rear lights "Chicane"
- All seatbelts have pull-too-fast lock protection, 22 manual said rear only
- Warns you if you open the door with idle-stop active.
- If keyfob battery is weak, engine start procedure is a bit different
- Procedure to turn off rear sensors is different