https://www.techradar.com/news/new-nintendo-switch-model-could-launch-in-2019

Nintendo has a long legacy of tweaking the hardware of its consoles, from all the aesthetic changes it made to the Game Boy to the reconfiguration of the Wii, and it seems that the Switch will be no different. 

According to a report from the Wall Street Journal, an updated version of the Switch could hit stores in 2019, in a bid to “maintain the sales momentum of the device”, citing "suppliers and others with direct knowledge of the plan".