In the Embers of Neltharion 10.1 Group Interview with Steve Danuser and Morgan Day, one of the questions asked pertained to cosmetic glyphs – Whether we would see news one or not, as we have not seen new cosmetic glyph additions in quite some time.
In the response, Morgan Day stated that Demon Hunters would receive a new cosmetic glyph for Throw Glaive in Patch 10.1, in which the ability would actually display their own equipped Warglaive being thrown instead of a generic one!