The UI Card System is actually the holographic AR system that will bring 3D real-time UI to Star Citizen not only at your ships but everywhere in the verse.
As the Inside Star Citizen video teases, the UI Card System will add new 3D holographic terminals to the game, making the actions such as buying or selling stuff much easier and user-friendly.
During the latest episode of the Inside Star Citizen video series, Cloud Imperium Games showcased a number of new ships coming to the game, but on top of that, the developer teased a huge step forward in the UI design by introducing the brand new UI Card System.
It still remains unknown whether the UI Card System will be replacing the current monitor-based terminals in the future or not, but we will receive more new information about this huge upgrade as we get closer to the launch of Alpha 3.18.