Overshadowed by the Nintendo Direct, the LABO Vehicle Kit came out yesterday. The main sites like IGN/Gamespot/etc don't seem to have reviewed it, but Gamexplain did.
Basically, it's the best kit so far because it actually feels like a fleshed out video game.
The main adventure mode will last you 5-6 hours (not including build time) plus there's a bunch of auxiliary modes like slot car racing, battle mode, etc.
The plane and car are apparently very fun to control, the submarine less so, though this is mitigated somewhat by the fact you use it the least.
Kinda seems like the kit LABO should've launched with in the first place.