With the new update, all Windows Store apps now have a badge.
This makes it so those apps can display the number of notifications you have, like from Facebook and Twitter, and it's meant to give you the ability to see your notifications and alerts at a glance.
The tweaker does that by injecting a DLL to explorer, hooking/subclassing/some other methods of the dark side.
You can always pin and unpin apps from your taskbar, but a new feature now lets you hide the taskbar when entering tablet mode. To enable either of these features, just go to the taskbar Settings page.
You can also change the colour of your taskbar, which will also change the colour of your Start menu and Action Center.
Well, first you won't want to pin any to the Taskbar, and you can also set them to not show up on the Taskbar when running.
Right-click the Taskbar and select Properties and select the Taskbar tab.