Fuji has announced two new lenses (actually, the lenses had been announced before, but no firm availability date was given):
FUJINON GF110mmF2 R LM WR Key Features
FUJINON GF 23mmF4 LM WR
Official Press Release:
http://www.fujifilm.com/news/n170419_01.htmlAt the same time, Fuji announced that it will be releasing a telephoto prime lens in 2018 (the diagram makes it appear that the release will be early in 2018, but not entirely clear)
Fuji also announced a new firmware update for the GFX 50s, stating:
These firmware updates will add new function for computer tethering via Wi-Fi and improve operability in exposure compensation and autofocus performance in difficult scenes.
The release will be available in late May 2017.
I found out about these developments on FujiAddict, which is an excellent source of information for the Fuji GFX.