As we told you before, Sony is going to not announce anything for the upcoming Photokina. But to reaction with just announced Canon EOS R and Nikon Z6/Z7, Sony has just changed their mind and decided to make a new E-mount mirrorless camera announcement before Photokina 2018 on September 26.
What can expect from Sony at Photokina 2018 ? Sony currently has no new camera codes registered, so we may not see any new Sony cameras (a7S III, a6700, a77 III, RX1R III) within next 1-2 months. But we may see some new FE lenses around this Photokina.
According to recently rumors, Sony may announce a new FE 24mm f/1.4 GM lens next. Currently, Sony GM lens lineup are all standard, medium telephoto, telephoto prime lenses, while lack of wide-angle GM prime lenses. So next lens from Sony will probably be a FE 24mm f/1.4 GM lens. Stay tuned for more info.