A well-connected source just secreted me a copy of the script, and if it plays out as currently written, it's guaranteed to be a horrible, horrible ending... for the lemmings.
The 1958 Disney documentary 'White Wilderness' purported to show how furry little arctic rodents called Lemmings, lived and died in a natural cycle of life and death. The film convincingly told us how when their numbers exploded and the local food supply was in danger of being unable to support them, nature in her all wisdom would inexplicably cause the lemmings to migrate to cliffs and jump into the freezing arctic waters. Those that survived the fall didn't turn back after being roused to their senses by the icy cold. Instead they pressed on, a tangled mass of fur moving away from their natural element into ever deeper waters and their inevitable death. The film was beautifully shot and edited which earned the producers an Academy Award as a documentary film.