Nvidia has recently post invitation to join Gamescom 2018 where they may reveal information about their new generation of video cards, media is speculating that an announcement could be done a day before Gamescom at the GeForce Gaming Celebration that may take place on August the 20, topics that will be discuss are latest hardware and a surprise from Nvidia.
The mining community has speculated a lot the past 6 months about new cards, their performance and if it is still worth to invest on GPU mining based on price and ASIC competitor performance.
We will have to wait a bit more, I think since Nvidia focus is not mining and besides they don't have a real competitor on the retail market, next Nvidia generation could easily be a refresh with just a small bump on performance, we have seen them do this in the past.
Sources:
Nvidia.com http://bit.ly/2O4VH3M
Anandtech.com http://bit.ly/2AuqVj3