Ninty Mobile plans, stock up by 55% at close after 2 days.

[Materia-Blade]

Soundwave said:

Samus Aran said:

NeDa is going to develop these games. Nintendo still make games for their own hardware.

It's perfectly possible to do both things.

They will be jointly developed. Most likely Nintendo will design the core gameplay to ensure good quality and then DeNA will be responsible for maintaining the content back end of it (ie: daily updates, leaderboards, online play, microtransactions, new DLC content, etc.). 

And most likely only a small part of nintendo will do that.