Interesting comments thanks all.
Since we are only doing grades 1-4 I think the topic is best covered by the stories Lynn pointed out. We have done eternal life, and are right now doing the Lord's Prayer and plan to do the assension this spring.
Sad that whole demoninations are avoiding a book in the Bible just because it's difficult though. If I were teaching older children/teens I would want them to atleast know about Revelations and that their are various interpretions. Some parts are pretty clear; Jesus return, judgement, new heaven & earth. Also the pictures of worshiping God by the heavenly beings are pretty awesome. I just think if we don't teach our children the beginning and the end, then they are more likely to get off track with who knows what!