This is actually a good question for which I can't find a straightforward answer.  However, I know a few composers who work in the smaller end of video game music and can say that it varies in their experience from game to game, but a lot don't start music production until substantial work has been done.  The reason being video game music is very tied to the atmosphere and tone of the levels and world, which can change quite drastically between concept and final product.  So they want to wait so composers can work with the final aesthstics in mind.  It also varies by composer.   Each has their own work flow.  Some start with the main theme and work out, otjers write almost all the other music then makes the main theme based on all of that.  And some are comfortable working with a mix of in game visuals and concept art while others only work with in game visuals if at all possible. 

It's nothing new really, the User ID came out back in December.

http://nintendoeverything.com/my-nintendo-now-features-user-id-and-child-accounts/

Added it. 6 letters minimum. How dare you!!!!

just saw first advert on UK TV, calling it a home console you can play anywhere. 1-2-Switch was the game advertised

Anytime...Anywhere....With Anyone

seems to be the tagline they are going with, not sure if this was already known or not

http://gonintendo.com/stories/274382-when-to-expect-switch-previews-reviews

Switch previews out 23rd of Feb, reviews 1st of March.

Zelda previews out 24th of Feb, reviews 2nd of March.

Just updated my ID, got to claim platina properly this time :p

It's the Zelda launch :p 

Finally was able to do the user ID thing, I was able to claim mike 321

Yay, i was able to claim my full username as NA .

The review embargo's are a little later than I expected/wanted :( I was hoping a few days earlier to get people more hyped and talking about it rather than the reviews arriving as your getting the console anyway.

Saw the Switch at Manchester event. played Zelda - Mario Kart 8 Deluxe - Splatoon 2 and Arms. didn't q for 1-2 Switch or Snipperclips.


Zelda looks and feel amazing - only 10 minutes available but it looks amazing - best looking Zelda game ever.
The tutorial feels very similar to SS.
Splatoon 2 plays better then 1 but looks unchanged.
MK8D has improved textures and it plays as smooth as ever.
ARMS is fun, controls respond very well and there is lots of potential.

Overall the Switch console is tiny, looks very small but I guess that's ok.
The Joycon are good and the grip improves a lot with the grip thingy.
Pro controller feels better than the wiiU one.