According to an article over on Wccftech, well-known dataminer and console hacker SciresM has uncovered "new information" about the rumored Switch 'Pro' model by sifting through firmware code - although the source says these details may not necessarily be accurate and there is a fair bit of speculation, too. People think sources aren't true. the revised system could apparently be codenamed "Aula" and utilize a Mariko SoC. In addition to this, it's believed it will feature both docked and handheld play, 4K using docked and (potentially handheld too) and could potentially include an OLED screen. The Realtek chip might also be in the dock, rather than the system.
This console might have some exclusives like "The Legend Of Zelda Breath of the Wild 2" and "Metroid Prime 4"
Here is exactly what SciresM had to say. Source of discussion