Ewen Callaway wrote an excellent review of the state of our knowledge concerning the D614G variant of the SARS-CoV-2 Spike protein: https://www.nature.com/articles/d41586-020-02544-6

Gif made by Nik Spencer using coordinates from Kuang Shen; see our manuscript at: https://www.biorxiv.org/content/10.1101/2020.07.04.187757v2