At this time, DX12 is merely vaporware... it's not even shipping for XBox One until "holiday 2015", which is, what, 16 months from now? It might live up to MS's claims, or it might not.
This sort of announcement is a typical Microsoft [url=http://en.m.wikipedia.org/wiki/Fear,_uncertainty_and_doubt]FUD[/url] exercise. it's a sign they are really worried about the performance disparity; but don't have a short term solution.
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It won't live up to claims. A software update isn't going to double the Xbone's performance as many believe.