Oracle's introduction-plus-reference for FXML should be updated to correctly reflect the current release. The discrepancy I noticed is in section "Expression Binding":
http://docs.oracle.com/javafx/2/api/javafx/fxml/doc-files/introduction_to_fxml.html#expression_binding

This section states that operators in expressions may be added in the future, but they are in fact already supported in the current release version. There may be other discrepancies; it would be best if the whole document was looked over by an FXML expert. I only became aware of this issue because John Smith notified me.