The people declare that they are so filled with the spirit that the "have great views of that which is to come." Very specifically, this is a reference to the future Messiah. Note that when Benjamin began to speak of the Messiah he specifically says: "I have things to tell you concerning that which is to come (Mosiah 3:1)." Therefore the people are declaring that they understand the mission of Christ in his atoning role, as Benjamin has laid it out. The spirit is so strong, that they could prophesy.
Once again, we should remember that this is a stylized account representing the strength of feeling, but probably not a specific reality for each and every person. Nevertheless, as a community this is a true statement.