Update: Nintendo of America has a listing for mid-August 2019 for the new Switch model. Meanwhile, in Europe, Nintendo UK confirmed to Eurogamer that "consumers should start seeing the new packaging on store shelves starting from early September" in the UK. If you're holding out for one of these new models, you should probably wait until then.
The original story follows:
The Lite isn't the only Switch revision coming to market. An updated version of the base Nintendo Switch, with slight hardware tweaks to improve battery life, is on the way.
The new Switch model (via Nintendo of Japan) seems largely the same as the launch Nintendo Switch, and will even be priced similarly. The big change is battery life-4.5 to 9 hours, depending on the game, on the new Switch model. This is a nice upgrade from the current Switch model, which ranges 2.5 to 6.5 hours.
Using The Legend of Zelda: Breath of the Wild as a comparison point, the difference is 3 hours' battery life for the undocked version of the base Switch compared to 5.5 hours on the new revision of the model. While this is set to launch in late August for Japan, there's no word yet on pricing and release date for the US, but we'll update this story as soon as we know.
This confirms a lot of the recent rumblings that the oft-rumored "Switch Pro" would not be a major upgrade like the Xbox One X or PlayStation 4 Pro, but a mild hardware tune-up. Signs point to this being the model revision filed for recently, though we'll have to get more details to confirm whether it's packing the "Mariko" chip or not.
A little bit more battery life never hurt though, especially when it has to compare against the Nintendo Switch Lite's portability. Be sure to check out our guide on all things Nintendo Switch Lite to see what the differences are between it and the original, now newly improved, Switch.