I don't think they'll only aim at the "future for Nintendo fans". Nintendo fans will be there.
They have to show a really bright future for everyone to
consider Nintendo in their home/hands.
Anyway the good thing is that the can easily show first party games that are not "too Nintendo" for some people. Though the market is different in every region.
It's more than obvious that they're going to focus on the launch, but since we have the treehouse, hands on in big cities as well as 2 months remaining to market the launch, I think they can be a little more open in the presentation.