At CES 2014, ECS showed us their latest Intel Bay Trail motherboards. The BAT-I and the low profile version, the BAT-TI.
If those aren’t small enough for you, they also have their Mini Lake system. Smaller than the Intel NUC, doesn’t mean they will sacrifice hardware. It will have 2GB of DDR3L memory, 32GB or 64GB eMMC storage, 1x USB 2.0 and 1x USB 3.0. While they had two models on display, the clear model is an engineering sample to show how it is laid out, while the black case is more production ready model.
Of course that wasn’t all they had on display, their other motherboards were also on display, such as their Drone Z87H3-A3X Golden edition.