Sony has released a pair of super telephoto lenses: the FE 200-600 F5.6-6.3 G OSS zoom and the FE 600mm F4 GM OSS prime. Both will be available in August for $2000 and $13000, respectively.
Unreleased Sony 200-600mm F5.6-6.3 G OSS FE lens prototype appears on auction website: Digital Photography Review
Sony 200-600mm and 600mm FE officially announced! – sonyalpharumors
Sony FE 200-600mm F5.6-6.3 G OSS Lens Review
Sony FE 200-600mm F5.6-6.3 G OSS Field Test - Amateur Photographer
Sony announces 200-600mm F5.6-6.3 G OSS and 600mm F4 GM OSS lenses: Digital Photography Review
Sony Introduces Super-Telephoto 600mm F4 GM OSS & 200-600mm F5.6-6.3 G OSS Lenses – SonyAlphaLab
Comparing sizes of the Sony 200–600mm and 600mm FE G Master lenses, by Sohrab Osati
Sony 200-600 vs 100-400 Comparison & Review
Sony FE 200-600mm F5.6-6.3 G OSS Field Test - Amateur Photographer
Fstoppers Long-Term Review of the Sony FE 200-600mm f/5.6-6.3 G OSS Lens