Intel is planning a new small form factor NUC system dubbed Ghost Canyon X according to a report by FanlessTech. Ghost Canyon X will feature a larger 5 liter form factor that will be able to accomodate a discrete graphics card along with both M.2 and SATA 3 storage.
The Ghost Canyon X NUC will be powered by 9th Generation Coffee Lake HR processors that will come in i5 and i7 flavors. The chips have a 45W TDP and will come in quad core i5-9XXXH, six core i7, or eight core i7-9XXXH configurations (with HyperThreading) and will be paired with two DDR4 DIMMs (up to 64GB DDR4 2400 MHz or 32GB DDR4 2666 MHz). Ghost Canyon X NUCs will have three HDMI 2.0 video outputs, two Thunderbolt 3 ports, and a SD card slot for external I/O (likely along with USB 3.1 and audio outputs though those are not pictured). Internal storage includes up to 3 M.2 drives (two M.2 2242 80/110 and one 80mm) using PCI-E 3.0 x4 links and SATA 3 for standard hard drives and SATA SSDs. The biggest change with the NUC platform is the inclusion of a single PCI-E x16 slot which can be used to add a discrete graphics card to the system. While 5 liters is quite a jump up from the 0.7L standard NUCs and the 1.2L of the Kaby Lake-G powered Hades Canyon gaming NUC, it is still a fairly small system so not all graphics cards are going to fit but enthusiasts should be able to use GPUs that have shorter Mini ITX designs easily enough.
FanlessTech notes that the reference Ghost Canyon X NUC will most likely be actively cooled, but third party fanless cases from makers like Akassa, Streacom, Tranquil PC and others should be achievable with a 45W TDP CPU (and even GPU if you go with a lower end model).
Further details are still unknown and the pictured case design is still subject to change as the system gets further along in the design process and closer to launch.