Which brings us to one often debated question in our company: Are those screensavers real footage or animated? Anybody has an idea on the making of?

They are definitely real. In the SF one that goes over the bridge, you can see the shadow of the filming helicopter at the bottom of the screen.

And when the lens flares show up at the beginning of SF you can really see how hard the image stabilization is working to keep the image steady.

I believe they are real footage. I've read that they were shot from helicopters and drones using a stabilized RED Dragon @120fps, played back at 24fps.

OT but there is a very cool video from Davin Graham on how such a drone looks like while he was filming at Milford Sound, New Zealand https://youtu.be/l59Svj2E4lk?t=1m35s.

Edit: here is the final footage https://www.youtube.com/watch?v=dMGSrS_2R6I