I can't imagine they'd have done something to regress performance (has Nintendo ever done that? Sure sometimes they repackage which loses some capability but I can't recall them ever going with a lower performing processor). Seems like they just did a process shrink of the SoC while keeping performance the same.
Which that's kinda interesting. I was iffy on it being a new SoC revision, and that the Lite's extra battery life probably coming from ditching the Joy-Cons, the smaller display, and maybe a bit bigger battery since I figure losing the joy cons and docking would open up a bit more internal room and with it being non-dockable (i.e. portable only, where battery life would matter more) they might would increase the battery. Seems like the Lite has an even smaller battery (or they also bumped the battery size on up on the non-Lite). Which I'm not even that impressed by the battery life gains if its just a die shrink. It'd be even less impressive if it was that and battery size increase. But then if they did the die shrink and shrunk the battery capacity, it'd be more impressive but I'd feel almost ripped off.
Unless it gets a price drop or comes with like two free popular games (Mario/Zelda for instance), I'd probably go for the Lite, even though I would value the docking capability. Then I'd wait for the rumored significant upgrade (with newer more power processor). Which might not be out for another year or two.