Changes have also been made to the layout of two of the circuits on this year's calendar: Bahrain and Silverstone.
Bahrain will now make use of the layout used by the 24 hour race held at the track:

And Silverstone will use its new Arena layout for the British Grand Prix (the new track is marked with a continuous red line, and the old route is plain grey):

My personal opinion: No comment on Bahrain (IMO it looks like a bird with its brains spilling out now

), but I reckon Silverstone's new layout id dynamic and challenging. Of course Bridge Corner won't be used anymore, but the new track built seems super fast, and will probably go some way to making silverstone a bit more like the flat-out airfield circuit it once was.