During a Q&A session, The Pokemon Company said the late 2019-due title will be completely new and will not follow up on the newly announced Pokemon Let’s Go, Pikachu and Pokemon Let’s Go, Eevee, nor will it be influenced by Pokemon GO. While Pokemon Let’s Go, Pikachu and Pokemon Let’s Go, Eevee are more focused on home gaming, the late 2019-due Pokemon RPG will be more focused on elements of the handheld games. It has been in development since before the Switch was released. (via, 2, 3, 4, 5)
Further information was not announced.