Here's what he proposed:
New transport, which he even shows is just an extension of what they have already done. The customisation feature is neat, but again you could something similar in New Leaf by changing the Train Station's look.
The toolbox. This is a good idea, as using the envelope trick is something I'm sure the development team must be aware of people doing.
Stickers. I'll be honest, letter writing is the least used feature in any animal crossing game for me so while it looked pretty I wouldn't make use of this type of feature.
Then you have the graphics, which is where the video really shines, but considering we have no idea what Nintendo would do for Animal Crossing NX (because we all know it won't be on Wii U) we really can't comment on what Nintendo's approach to this is. Remember this is the Nintendo that's really impressed this gen with their graphics (remember Mario Kart Wii to 8?) so honestly I wouldn't bring their lazy Wii effort into this. New Leaf however was a nice looking game for 3DS.
And that's it. New Leaf on the other hand introduced oodles of ideas that the series really needed, like greater house expansion, public project, town creeds, item customisation and even changing the character proportions to name just a few.
I'd say the series is in the hands of a competent team. Even Happy Home Designer added interesting new idea to the house designing element (ceiling items, changing windows, exterior decoration etc) of the series and that's just a spinoff.
If you were to say this video demonstrated more ideas than New Leaf that would be quite frankly poppycock.