The Swedish website Fotosidan published their review of the new Panasonic G9 camera ($1,698) and they confirmed that the next lens announced from Panasonic will be the Leica DG Vario-Elmarit 50-200mm f/2.8-4 ASPH Power OIS (see screenshot above).
This Leica DG Vario-Elmarit 50-200mm f/2.8-4 ASPH Power OIS lens has been under development for a while and will be Panasonic's 10th premium lens after the Leica DG Elmarit 200mm f/2.8 POWER O.I.S. lens ($2,998) was announced earlier this week (see all Panasonic MFT lenses). The lens was first displayed at the 2016 Photokina show: