Wait until the processors come out and see if they release new boards. I have built with the rampage gene and I can say that it is a great board. Only problem was the lack of included wi-fi. I believe they will release new boards. They did with z68 to z77. x79 to x99 (This is wrong. I meant to say Ivy-E) should be no different.
Edit: X99 is Haswell-E ignore that please. My point still applies
Edit: X99 is Haswell-E ignore that please. My point still applies