Should it be a direct? Maybe at a convention? I think a direct would be a smart way to do it, it  differentiates from their other games, and allows them to focus on just mobile. what do you think?

Yes, they should have a direct dedicated to mobile games. I feel like doing it at a convention would be a bit impersonal, while a direct would be streamlined just for the fans. Plus there wouldn't be any awkward filler with someone onstage trying to demonstrate it live.

If it's during the direct, hopefully it won't take too much time out of it, but there should be some advertising and awareness for their mobile games too

they said they didnt want it in their e3 direct, feels like the market that would watch the direct would be too different and wouldn't enjoy it. 

Yeah, a good decision, because they can focus more on 3ds and wii u games

Though I meant about their directs in general, not the digital event at e3.. sorry for being unclear :p

They don't produce enough directs as it is, to me it would be a waste of a direct for something that as of now I have zero interest in.

They've already said E3 isn't an appropriate venue so I doubt a Direct would be either.

I don't know about showing them off but promotion could be done by giving download codes to existing Nintendo system owners. Enough people would download the game/s to guarantee front page exposure on the Play and App Stores. Then it's up to the masses....