As you've probably figured out by now, there is one model with a Core i7 processor (the Core i7-8559U), two Core i5-8259U based models, and one NUC with the Core i3-8109U. Interestingly, all five systems feature Iris Plus Graphics 655 with 128MB eDRAM.
Featuring the i3-8109U (2C/4T up to 3.60 GHz, 4 MB cache), i5-8259U (4C/8T up to 3.80 GHz, 6 MB cache), and i7-8559U (4C/8T up to 4.50 GHz, 8 MB cache) the Coffee Lake NUC will also rock Intel's Iris Plus Graphics 655 and 128 MB eDRAM. Clearly, Radeon graphics aren't a sustainable option for Intel.The NUCs measure 117mm x 112mm (L x W) and have a height of 36mm (BEK models) or 51mm (BEH models). The Core i3 and Core i5 models will also be sold as motherboards, so system integrators can use them in their own fanless cases.