So far I see no evidence that it's farmed out. Everyone is assuming that...not sure why. This is Nintendo. They made the thing that is being emulated. It's worth it for Nintendo to do it right here as nolstalgia pays the bills that Pokemon won't.
A few years ago Nintendo went to amazing lengths to remanufacture Game in Watch Ball with the end result being more or less perfect. While Ball is not a technically amazing thing on its own, it's worth pointing out that electronics like that aren't being made anymore and creating the remake required some interesting ways of doing things. There is an article about how they made it floating around somewhere. Anyway, that was for a Club Nintendo freebie, not anywhere near as important as this.
Like I said, all the cool companies are turning shitty and dying so maybe now it's Nintendo's turn but I don't see any reason to assume this. They've been aware of Famiclones since the 90s. Now it's their turn and I think they're going to do a good job.
As for why there hasn't been an anouncement of a Famicom Mini, I don't know. The NES/FC GBAs were not anounced at the same time either so maybe it' just hasn't been revealed yet. Also, Japan...just isn't as important as it used to be, frankly. The days of everything debuting in Japan, selling millions of units there and then going worldwide are over. Also, this would certainly not be the first US-only Nintendo product.
