This is subsumed almost entirely by P2314. If there is any further work, it would be a new paper that references the old, and based on the work done since then. I don't plan to do further work, nor do I see a strong need for work, on P1859. 

It does propose that the encoding specified at runtime based on locale have a shorter name, dynamic encoding, but did not propose any wording regarding that. That might be a term useful if we ever do some cleanup in the library sections in the future.