I'll commend them for trying something different but I personally was just not a fan of it. Different doesn't always mean better though it does look like they were able to build upon the concepts and make the later games into something that more...
I've definetely seen screenshots but never the full video. All videos I've seen relating to the trailer were uploaded at most 4 weeks ago so I assumed it was just found recently. Also the description of the video said this so I kinda too their...
I think it depends on whether a third party developer can come up with a compelling pitch for Nintendo. I think Renegade Kid who developed Mutant Mudds tried to pitch a remake of VB Wario Land on the 3DS to Nintendo but Nintendo declined. Though...