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I assume you are referring to the LGA 2011, X79, and SB-E Sandy Bridge Extreme. If so they are essentially the replacements to the LGA 1366 / X58. The differences are 32-lanes of PCIe, Quad Channel DDR3, no iGPU support, 6-core CPUs.
November 14, 2011 is the release date.
See -> http://www.tomshardware.com/news/ASUS-X79-Rampage-IV-Extreme-ROG,13819.html