OS X menus do not have mnemonics. They should be removed from the context menus where they appear (e.g. the editor and project pane context menus).
Also, there is an unfamiliar symbol used in the shortcuts in some of the menus. For example, right-click in the editor, and choose "Folding | Expand", there is a symbol I have never seen before between the symbol for the Command key and the Plus sign. What is that? It looks kind of like a keyboard with the space bar highlighted.
PS. I am using build 681.