Macman : No, there are actually MANY sites with rumors about the x86 OS X (apparently dubbed 'Marklar'). Nothing substantiated, just pie-in-the-sky wishing.
At this point, considering the 970/GPuL/WhateverthefuckIBMcallsitnow is a reality, and IBM seems much more interested in chip production now, hopefully the Marklar stuff will die away, and be forgotten forever...