AMD is planning to launch a 7 nm gaming GPU codenamed Arcturus some time in 2020, but before that, the red team needs to come up with a viable alternative to Nvidia's new Turing GPUs first. Rumor has it the Navi GPUs scheduled for next year are still on the GTX 1000-series level, but, since the RTX 2000-series is overpriced for now, AMD might have enough time to fine-tune the Navi cards and even push for more aggressive prices.
https://www.notebookcheck.net/AMD-reveals-codename-for-upcoming-7-nm-gaming-GPUs.336366.0.html