Driver management has moved from AppCenter to System Settings → System. The new design for drivers is more in line with how drivers are managed on other operating systems and is easier to work with, especially for hardware that has multiple driver options like NVIDIA graphics.
Power settings now shows the charging level and status for both internal batteries and connected battery devices like mice and keyboards. You can also choose to automatically set different power profiles based on whether your device is plugged in or on battery power, and power modes can be quickly changed from the power menu in the panel. Plus the battery icon in the panel will now show much more accurate battery levels for mobile computers.