EVGA has just teased their next-gen X99 motherboard at Computex 2014 via Twitter. There really isn't any details at the moment besides the layout of the board. From what we can see, there are a total of 5 x16 PCIe lanes with a single x4 lane. Also, there seems to be 10 SATA ports and right-angle connections for the 24-pin power. As soon as we get more information, we'll let you know!
EVGA Teases Next-Gen X99 Motherboard | Digital Storm Unlocked