That[1] was masterful marketing of an upcoming videogame console on all fronts. From the beginning it emphasises mobility with a (hopefully good!) smartphone app to manage online/local wifi matches, as well as multiple levels of play while on the go. It's reasonably priced (matches current generation in total at the register) and has an incredibly diverse range of titles to be excited about this calendar year. It managed to loop "The Americas" in with a Reggie appearance that worked well, and upsold Skyrim and Fifa, two gigantic American games with international appeal. They also talked up Dragon Quest X, which is an MMORPG, launching on Switch, as well as Dragon Quest XI, which until tonight was a PS4 exclusive.
Essentially, they placed value squarely in the face of everything your PC/enthusiast-level gaming rig won't ever replace. The ability to pick up and play elsewhere. Like the Wii, it's not even trying to compete with the current crop of consoles. It's value proposition will be placed somewhere a bit obtusely, between your mobile phone and everything else you leave at home. Yes, this obviously functions as a home console as well, but I can't help but suspect Nintendo absolutely meant to go for what makes handhelds great. If any company can do it, they can. So what if it cannibalises their current 3DS offerings? Pokemon seems to be going strong with its fanbase.
The whole presentation, from the demonstration of the hardware to especially the finishing trademark "One more thing!" with Zelda making a predictable but nonetheless amazing launch date. It's a strategy that worked wonders for the Wii, remember, so why not?
Nintendo absolutely killed it, and I'll be keeping a really close eye on this thing. But the marketing and presentation was honestly textbook.
[1] https://youtu.be/uuC4YLLkqME?t=33m20s