I miss the old orders interface. Sorry, but a context-sensitive menu is _much_ easier to use than a tabbed panel where hotkeys do different things on different panels (I've popped smoke or bailed out when I didn't want to).
I also miss the information in the old target command--firepower, percent chance to hit, that sort of thing.
Finally, I miss the information about the units. I'd like to know how much firepower a unit has at a given range, how much armor, how much penetration for the gun, etc.