Apps open in the order you use them
Your Apps grid is now ordered the way a phone orders apps: whatever you opened last comes first, and apps you have not opened yet keep their place behind them. Nothing disappears from the grid because you have not used it.
The home page also stopped rebuilding your app list every time you open it. Which apps you have is recorded when you install them, so opening your home is now purely a read — the grid appears as fast as the list arrives.