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I guess this is just another bug, i had the same thing with november update (appeared 3 times)
For the battery gauge, I had the problem today, try hold power button and volume + for 15 seconds.
Wait 10 seconds and boot :)
Try to use the desktop interface more than 5mn only with the touchscreen and come back later.
Selection, drag, multi selection is way more...
I have this problem sometimes, but it disapears with a shutdown/start or a reboot (this is not the same thing).
I discovered this software last week and I want to share it with you :
TouchMousePointer - virtual touchpad (on-screen mouse)
It adjusts brightness for the cover backlight and not the screen.