The "I have too much free time" Question of the Day!
Take a look at this apple comparison page -
1) Why do you think they chose stocks as the new app to display on the homescreen?
2) Why do you think they didn't fill the bottom row?
1) Stocks sounds professional, so why not?
2) No clue. I'm a bit weird about empty spaces on homescreens, but I also like symmetry. Therefore, I either have all my rows filled or I leave a row completely empty. If the bottom row would squeeze to the center the way the dock does I would be very happy.