Tldr: Got this from resetera. I'd consider it as a rumor for now, but it's gaining traction.
- new more powerful switch model set to release early next year (Q1?). Mass production to start soon.
-A Nintendo direct might come out by Sept 16
Posted August 24th
Now Bloomberg is on it, and are claiming it might have 4k graphics. Lol
Nintendo Co. plans to debut an upgraded model of its Switch console next year along with a lineup of new games, people familiar with the matter said, ceding 2020’s holiday spotlight to rival devices from Sony Corp. and Microsoft Corp.
The specifications of the new machine have yet to be finalized, though the Kyoto-based company has looked into including more computing power and 4K high-definition graphics, people briefed on the strategy told Bloomberg News, asking not to be identified because it’s private.
The release of the upgraded Switch would be coupled with, or followed by, a slew of games from Nintendo itself and related outside studios, the people said. Those games would address a wide range of players, from casual gamers seeking small doses of escapism to more devoted fans putting in marathon gaming sessions. The focus on next year’s pipeline explains Nintendo’s relatively quiet software release schedule so far this year, the people said.
Posted August 25th
If this is true, Nintendo's first 4K console will actually be a handheld :\
Posted September 6th
So, what if it is?
And if the rumors are true, likely not on handheld mode. Nintendo will still run the hybrid console design.
They could actually use DLSS on an 8nm chip that is 2-4x more powerful than the tx1 to achieve that, since PS4 pro specs on a handheld console is probably not going to be ready for a few more years
Edited September 6th