Obviously (hopefully) it’s unfinished in terms of graphic effects, but this isn’t really about that. Something much less obvious that maybe ANET already plans to do and maybe they don’t.
Eternity’s icon has a distinctly unique hilt compared to Sunrise or Twilight. If this is not something already intended to be implemented when Eternity is being polished off, I would recommend giving it that unique hilt and letting the blade/effects do as they normally would while the unique hilt remains the same.