First drive review here has some good details, including drag coefficient of .21 and more notably a new battery precondition system:
"A new battery conditioning system will make this kind of experience more reliable. If you’ve plugged a DC fast charger into the nav system, the car will use some of the battery’s energy to make sure the pack is at the correct temperature to ensure it can take advantage of that much direct current, even if it’s extremely hot or cold outside. Some Ioniq 5 models will get this battery preconditioning technology for 2023. "
"A new battery conditioning system will make this kind of experience more reliable. If you’ve plugged a DC fast charger into the nav system, the car will use some of the battery’s energy to make sure the pack is at the correct temperature to ensure it can take advantage of that much direct current, even if it’s extremely hot or cold outside. Some Ioniq 5 models will get this battery preconditioning technology for 2023. "
