Pokemon go when you're out of the docking station. Plug it in and you've got a regular pokemon game.
Okay...I admit I thought up this thing in a sarcastic mood, but it makes more sense than the same old "better graphics when plugged in". If not for anything else, it's because the nintendo audience never cared for graphics (no, this isn't sarcastic either).
What you've got to think about is that gaming on the go is different than at home. Games should reflect that. Of course the majority of games won't do much with it aside perhaps build in more save points, but it's best to take a look at their strenghts and weaknesses:
Cradled:
+infinite playtime (no discharging battery)
+less disturbances
+being able to play longer
-not much use in using spotpass or GPS stuff
On the go:
-limited battery life -> not convenient to expect longer or graphic heavy stuff (it'll rapidly drain the battery)
-limited expected game time (there's a reason mobile apps are short: people tend to have just a few minutes to spare)
-more environment noises -> games shouldn't rely on audio feedback (unless it's the main mechanic)
+more likely to link up with other switches -> local multi-screen multiplayer (aka: quick LAN setup)
+ability to use spotpass, streetview and similar stuff?
+also more mobility outside the TV -> off-tv play or around the house
Note that I don't know more than others when it comes to this thing. But unlike the wiiu, nintendo has built this thing in a world where tablets are common goods. They know that their audience is used to browsing stuff on the go. Knowing nintendo they'll probably won't go all the way (meaning: put android on the thing), but my guess is that most games will have at least a bit of "mobile mode". Think animal crossing or harvest moon, where things are set to happen in real time, so the audience will have an excuse to check their growing crops/houses on the go (probably also having an option to actually PLAY these games, but mostly a way to quickly add things without loading the entire world). Or a "switch fit" game where the switch monitors your calory intake while the actual games and exercises are meant to be played in your living room*.
*I...don't want to envision a world where people just go around yoga-ing or doing sit-ups in public just because their game console tells them they haven't burned enough fat.