The first picture of an RTX 3090 Founders Edition in a case has been published online, and it is huge. NVIDIA's new 12-pin power connector sticks out like a sore thumb, too.
https://www.notebookcheck.net/Hands-on-NVIDIA-GeForce-RTX-3090-Founders-Edition-picture-showcases-the-card-s-gargantuan-size-and-ungainly-power-connector.492833.0.html