That’s Uber’s new logo which isn’t a stylised “u” anymore. Which is a weird choice that doesn’t seem at all connected with the name of the brand.
The new logo, along with quadcopter-like background, is already everywhere from App Store:
To the official Uber twitter account:
— Uber (@Uber) February 1, 2016
The old “U” one is still trademarked by Uber, but I bet we’ll be seeing a filing on the new one relatively soon.
There’s no real reason for the change we can tell, other than maybe that Uber is trying to make itself over as a company. In which case, a weird disc with a square isn’t going to cut it.