2.) You will now be required to pay the upgrade cost to upgrade your apartment door. No more getting away with a free upgrade. It will tell you what the cost is to upgrade before taking your chyen.
3.) You can no longer program in additional combinations. These combinations never worked from the inside anyway. You can still program the primary code.
4.) You can now 'peek <door> at <someone>' to look at someone who's outside your door.
5.) There were structural changes to the 'push' command that changed the order in which you got messages about your actions. Please pay attention to what the messages say. :)