I don't know about extreme microtransactions. The thing is Nintendo is very sensitive about the kids market, and in a way getting kids addicted to microtransactions is a but like getting them hooked on gambling or something. I think Nintendo is fundamentally against that.
They will use the F2P model, but I think they will keep it sensible ... ie: for $2 for get 2-3 Zelda dungeons or a 4-5 Punch-Out opponents or whatever.
I don't know if they'll go down the entire nickle and dime route. They could have done that with Mario Kart 8 DLC too, but it's been quite reasonable and I think the player feels like they're getting good value for whats being offered.
To be honest that might also be what the paid part of the Nintendo-DeNA service is ... if you pay a flat monthly fee maybe you can play all of Nintendo's iOS/Android content and get all the DLC stuff unlocked, that way parents don't have to worry about the scenario of their kid racking up some huge monthly charge on in-game purchases.
