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It probably indicates the transition to a new battery technology. The 1DX uses a new LP-E4N battery. The Canon 1DX spec sheet (link below) shows the 1DX will work with both the new LP-E4N and the old LP-E4 batteries. I've heard (probably here) that the new batteries should work in old bodies but new batteries will not work in old chargers. So, the writing is on the wall, but it appears to be a gradual replacement process, not something that will eliminate LP-E4 batteries in the short term. I guess the new 1DX charger will be called LC-E4N.
P.S. most of this info was posted earlier in http://www.fredmiranda.com/forum/topic/1080925