I now have the answer about case fit and some discouraging information about the camera bump on the Pro modes. Some folks ordered cases early and have received them. According to tweets and pictures in this article, the bump is much larger and thus requires a bigger hole in the case. Furthermore, the rim of the camera cutout is taller, indicating that the camera block and/or the lens stick out further from the phone. The slight edge of the iPhone 12 Pro cases kept one from laying the phones flat on a surface, and the problem will be even more obvious on the 13’s. Also, it will be harder to slide the phone (with or without a case into pockets.