Nintendo has filed an application with the Federal Communications Commission, according to which it intends to update the existing Switch box without having to re-certify the device. According to the application, the company intends to “change the type of SoC” (system-on-chip or the main chip), “change the type of NAND-memory” (internal memory) and the motherboard due to changes in the above-mentioned two components.
This is not about Switch Pro. And only about updating the existing model. So you should not hope for a noticeable performance increase.
Most likely, the company is going to equip the original Switch processor Nvidia Tegra, which was finalized for the Lite-version of the console, presented yesterday. Therefore, one can hope only for the increased autonomy of the new Switch revision.