An entry for the upcoming Nvidia GeForce GTX 1180 graphics card has been made in TechPowerUp's GPU database. Notebookcheck already reported on rumors surrounding the next-gen GPU and the data that has now surfaced online seems to support some of the expected specifications, including 3584 shading units and a 256-bit memory bus.
https://www.notebookcheck.net/More-details-about-the-Nvidia-GeForce-GTX-1180-surface.302838.0.html
All the data is speculation, many websites do it. I remember TPU made a Vega page that was completely out out of this world when the actual GPU launched. If you take a closer look at many GPUs you can still see wrong information.
16GB of RAM would certainly not put a smile on my face at current costs... especially not as it's going to be functionally useless for a couple of years. It gives you a nice idea about how much they plan to charge for this, though.
That 16GB of ram is certainly very very useful at even this current time. VFX renders and especially volumetric simulations need a ton of gpu ram, and since CUDA cores are used across almost all VFX and filmmaking applications the extra ram is excellent. Don't just think the sole purpose of a GPU is gaming, it's a recurring pattern to see people state so.
What doesn't really make sense is that the GFLOPS are exactly the same as a GTX 1080TI. The number is too much alike, so it's not accurate.