For those that can read French (or are handy with online translators), I was reading an article just now that goes into Spa, and the Eau Rouge/Raidillon section specifically:
https://ici.radio-canada.ca/sports/...eau-rouge-raidillon-sebastian-vettel-w-series
They describe the section in detail and discuss its history, and go into some of the peculiarities of Spa (like its microclimate). I found it very interesting. It also shows Vettel again as the nice guy through his concerns about the track and racer safety after Norris's crash.
They also mention this bump that came up in this thread ahead of the race. It is likely to have been caused by damage done by big rains that happened in early June. Big like this (tweet from June 4):