Though not to be confused with the previous (non-real product) Rampage IV Extreme in black, the official Rampage IV Black Edition is a whole new product you can buy with a full stack of 2013 ROG innovations:
Ivy Bridge-E optimized design
The only ROG with an all-black color-scheme.
SupremeFX Formula  with WIMA and ELNA capacitors, OpAmp headphone amplifier and 120dB SNR.
Sonic Radar software
Extreme Engine DIGI+ III (VRM design)
12 SATA [8 SATA 6Gbps]
8 USB 3.0
USB BIOS Flashback
2013 UEFI updates, including Secure Erase, Last Modified Log, Quick Note and ROG Pulse (see more on our innovations page)
Additionally the ROG team went through 5 full layout designs to find the best possible 8 DIMM memory layout topology, and where the ROG team was working on the five new Z87 boards in the first half on this year, that whole team has focused efforts on just the Black Edition this time around!