Is the switch version going to be added to this board or made onto a different one?

It will be a different one all together as the game has to many differences to be added on here

should a new leaderboard submission be made then since the game comes out in like a week?

I believe when submitting you have to have gameplay as well so we cannot

yeah you'll need a sample run when submitting for a new board. I have a friend who's a mod on SRC so you can check it out with him if you want https://twitter.com/Techstrobe