"X continues to do well academically in all subjects. Please continue to encourage him to go beyond the minimal expectations and to expand on the curriculum by further researching related topics, coming up with projects, etc.
My DD8's teacher said this to me at conferences and I was taken aback. On the one hand, it shows she knows my DD is capable of more complex work, but on the other hand, why should she HAVE to work beyond the class? I think this just goes along with what I always see at conferences, which is that no matter how far ahead your child is, they always have to find something "constructive" (read: critical) to say. Argh!