Instead of using a solid metal block at the bottom of the CPU cooler, a Horizontal Vapor Chamber system will instead contain a vaporized mixture. When the CPU generates heat from anywhere on its surface, the vapor will absorb the heat, and distribute it across the entire surface of the heat sink, not just the local area. The actual changes in phases from liquid to gas and back create a circulation of heat up to 8 times more efficient than traditional coolers.
Other coolers have been doing something similar with the heat pipes for years, but Cooler Master is moving this to apply to the base of the cooler as well. The upcoming Cooler Master V4 GT, first to have CM Vapor Chamber Tech, should be an interesting cooler. It can be smaller with a lower speed fan without losing overall heat dissipation when compared to other coolers. Thanks to AMD Core Boost and Intel Turbo Boost, better temperature control could improve your system performance.