I think a new Switch model will launch in march 2021 (right before the PS5 release), but it will be a slightly enhanced version of the current one equipped with tegra x2 (for better battery management and OS responsiveness) and probably 4g data connectivity. It will be called something like Switch DX and in my opinion will be sold with and without the standard dock station.
Also my prediction for the Switch 2 :D
I think it will came out by the end of 2022 or march 2023. The base model will be based on tegra xavier or its successor (Orin chipset, most probably), have a 1080p screen and 5g connectivity, bundled by default with a standard dock station it will reach about 2.5/3.0 tflops. Also from the start, a new Pro dock station (already registered patent from Nintendo) will be sold separately with an additional chipset that combined with the handheld one will grant 4k output on TV and at least 7.0/8.0 tflops. In this way Nintendo will give third parties the possibility to port their next gen PS5 titles to the Switch 2 with reasonable good graphics quality.
Current Xavier nvidia chipset:
"The most recent Tegra SoC, named Xavier after the comic book character Professor X, was announced on 28 September 2016. Its release date was supposed to be in the first quarter of 2018. It is to contain 7 billion transistors and 8 custom ARMv8 cores, a Volta GPU with 512 CUDA cores, an open sourced TPU (Tensor Processing Unit) called DLA (Deep Learning Accelerator) It is able to encode and decode 8K Ultra HD (7680×4320). Nvidia aims for a 20–30 watt TDP and the die size is estimated to be about 300 mm2. Nvidia confirmed the fabrication process to be 12nm FinFET at CES 2018." ---> 1.3 Tflops
Next gen Orin Nvidia chipset:
"Nvidia announced the next-gen SoC codename Orin (resembling the name of an aquaman comic hero) on March 27, 2018 at GPU Technology Conference 2018. Presentations already indicate that a design with two Orin chips are planned to be on par with the performance that a Pegasus board with four chips (supposed to be formed by two Xavier chips and two GPU chips) and a factor of five in performance between Xavier and Orin seems indicated." ---> 5x xavier in performance
From wiki: https://en.wikipedia.org/wiki/Tegra
