Apple is now selling a new generation of the 5K LG UltraFine display. For the first time, the 5K UltraFine is now compatible with the iPad Pro, finally offering a 5K display option for 2018 iPad Pro users. Update: Apple’s support page says that the UltraFine display can only work with the iPad Pro at 3840 x 2160 @ 60Hz, so the quest to find a true 5K external display for the iPad is unfortunately not over.
Previously, the 5K UltraFine display would only work over Thunderbolt. Now, it can output 5K over USB-C DisplayPort, which means it can now work with any of Apple’s current Mac and iPad Pro lineup.