Dear 100 Hour Board,
Do you think the church will ever state whether or not plural marriages will exist in the eternities or not?
-My Name Here
It's kind of a damned if you do, damned if you don’t situation. So I seriously doubt it.
Technically starting with Joseph Smith the Church has consistently taught that plural marriages will exist in the eternities. It's only been in the past 50 years that we've moved from "it's definitely a thing" to "well, maybe it is?" But in 1986 Elder Bruce R. McConkie wrote in Mormon Doctrine that "Obviously the holy practice [of Plural Marriage] will commence again after the Second Coming of the son of Man and the ushering in of the millennium." In 2002 Elder Oaks gave a BYU Devotional that said "When I was 66, my wife June died of cancer. Two years later—a year and a half ago—I married Kristen McMain, the eternal companion who now stands at my side." Note the use of the words "eternal companion" to describe his second wife. So the Church has definitely openly stated it is a thing, and even if they haven't said it openly it's definitely implied even today.
But will they again openly say plural marriages will exist in the eternities? Definitely not. Two of the three members of the First Presidency are technically in eternal polygamous relationships, and I'm fairly certain the pattern (once your wife dies marry another single woman) will continue. If it advantages those in charge, it will continue. Also the Church is also really good at avoiding our past, or recognizing it but accepting no fault. Remember the celebration last year on removing the priesthood (and temple) ban for blacks? President Oaks said none of the (racist) explanations are correct but the ban was of God regardless. To say the ban was not from God, or to say plural marriages are not eternal, is to directly contradict past teachings and even scripture (D&C 132, anyone?). They'll keep it in that hazy middle ground so they can avoid apologizing or saying they were wrong.
-guppy of doom