Nintendo has announced a new revision of the Switch which seems basically identical to the original except that the battery life is now significantly better. Going from 2.5 - 6 hours of play time for the original to 4.5 - 9 hours with this new one. The official specs they've released say that the new model is still using the same 4310mAh battery as the original model, which means that extra battery life comes from more power efficient internals. Chances are that there won't be any significant performance upgrades with this new Switch, but, y'know, maybe.
It'll be out in September, presumably at the same time as the Switch Lite.