Yes and hopefully Max out those 4 x pci-e lanes.
Max out 8x maybe they are saying HUGE performance jumps for storage. I duno if all these x4 slots have direct paths to GPU's on all boards. My Z87 i duno so i will use the Gen 3 8x alongside my 980. Hopefully by the time that is saturated we will be moving to Gen 4. I duno if anyone has ever yet maxed out the lanes on a single card and modern boards so i am banking on that despite things like X-Point SSD's and HBM2 GPU's.
Just think no loading at all just a black flash between "worlds" will be great.