Then you surely won't know Elros, Thrain and Thror. Radagast is in it too.
http://www.imdb.com/title/tt0903624/fullcredits
This movie looks like it will be taking some great liberties, but I think it's necessary. If Elros is part of the cast there's going to be some ancient flashbacks, which is what I think the Gandalf and Galadriel scene is.