Yeah, this. I'm gonna see the movie, as I'm a big fan of the books and all, but the plot for the movie has been screwed up so much. Man, why can't they just stick to the original plot?
I'm not thrilled at seeing Peter and Susan either...they shouldn't show up until the Last Battle, and then only Peter.
The reason movie makers edit the plot line is because they are trying to reach more than just the fans of the book series, but I see your annoyance with it.