I wonder if they have a new control technique up their sleeve. Innovative gameplay and pushing new control ideas is one of Nintendo’s signatures. That said, being the switch 2, not a new console, maybe they kept it the same and just upgraded the processing and graphics hardware. Looking forward to more!
Both controllers have optical sensors (visible in the trailer), confirming the rumors that they'll have mouse like functionality. Remains to be seen if games will actually bother to implement it or if it'll remain a curiosity that only a handful of titles support.
Probably there will be a resurgence of point and click adventure games pushed by the new mouse functionality (or even republish some old sierra/lucas arts stuff with mouse support).
Also may be useful for pc ports like simcity clones and strategy games (i could use that in civ).
Some propietary nintendo stuff will use it like mario maker or wario ware, some zelda dungeon probably will have a gimmick around it. And also some small indy third party stuff, like i don't know, mini motorways, things like that, will be built arround it.