As part of the on going work to improve the Gnome Control Center, there has been an update today which brings some new features.
Improved Power Menu
As you can see, the power menu now visually communicates the batter capacity in the form of dashed green bars. I have not tested if the colors change based on the capacity, but intuition states that it must. Also you can hide the power indicator based on different behaviors like if the battery is charging, battery is present or never show indicator.
Hiding system indicators
With every update to the gnome-control-center, most of the system indicators now have the option to hide itself from the top panel. The power, sound, Bluetooth and network indicators have this option. How is this useful? Well if you are using a desktop PC where the internet connection is from a LAN cable and the battery is the power chord, there is no reason to display these indicators in the top panel. Also, you generally have a PC speaker which can be controlled directly removing the need for a sound indicator.
This is not a game changing update however with these updates you can now have a much cleaner top panel with only the messaging indicator along with the date, username and power cog shown.