According to an anonymous source speaking with TweakTown, the next generation of Nvidia GPUs will not be labeled as the once-expected GTX 20 Series but will be known as the GTX 11 Series. It is even possible that Nvidia will overhaul their naming conventions and start using identifiers that end in the number 5. No doubt more details will be revealed at the upcoming GPU Technology Conference (GTC).
https://www.notebookcheck.net/Nvidia-s-next-gen-GPUs-may-be-the-GTX-11-Series.291750.0.html