Note the first bullet under "WHAT THIS LIMITED WARRANTY DOES NOT COVER":
"design defects or errors in the Product (Errata). Contact Intel for information on characterized errata."
Guess we're not covered on this one.
EDIT: That being said, given the potential scope of this issue (years of affected CPUs, massive PR hit) I'm hoping that Intel will at least offer some remedy to recent buyers. According to the article from The Register [1], OS vendors have been working on the fix since November. The blog posted over on pythonsweetness [2] posits the bug may have been identified in October. It'd be interesting to know for how long Intel has been selling Coffee Lake CPUs that are known to be vulnerable.
[1] https://www.theregister.co.uk/2018/01/02/intel_cpu_design_fl...
[2] http://pythonsweetness.tumblr.com/post/169166980422/the-myst...