Just read online that Brazilian president Bolsonaro made an announcement that the Brazilian GP venue will switch back to Rio de Janeiro, in 2020.
I am a native of Rio de Janeiro and the location they selected for the yet to be built track is in a bad part of town…called Deodoro. For the article (in Portuguese) and a computer rendering of the track, browse https://g1.globo.com/rj/rio-de-janeiro/noticia/2019/05/08/bolsonaro-witzel-e-crivella-se-unem-para-trazer-formula-1-de-volta-ao-rio.ghtml