Tooltip suggestions
On the pregame hero/unit picking screen, there should be tooltips for ally/enemy units. New players haven't memorized each unit's portrait, so they don't know what everybody else is picking. Also, it would be a good way to learn what the units do without having to stare at the Collection or playing them yourself.
On a side note, in the Collection menu, Conduit's Drill Laser tooltip overflows the client's lower bound. Can't be fixed by resizing the client, as everything scales accordingly.