HMD Chief Product Officer Juho Sarvikas has all but confirmed the company's plans of releasing a successor to the first-generation Nokia 5. This device will likely be the Nokia 5 (2018)—or the Nokia 5.1.
https://www.notebookcheck.net/Juho-Sarvikas-Stay-tuned-for-the-Nokia-5-s-successor.302870.0.html