The Animaionic Maximus is an external dock allowing up to three graphics cards or other expansion cards, designed to help close the gap between the Apple Mac Pro and their (slightly) more affordable options.
https://www.notebookcheck.net/Animaionic-Maximus-An-upcoming-Thunderbolt-3-dock-supporting-triple-graphics-cards-for-Mac.453973.0.html
It's good that they've realised that locking out all the ports on the rear of the Mac Mini and giving far less isn't going to work for most who would find this increased graphics power useful. Shame it has to become that much larger and the integration isn't as neat but if that's what's needed to give more power (3 cards vs 2 cards) and keeping ports then that's ok. How much would this unit weigh?