As you've probably heard, Metaknight was confirmed today. Along with sir OP the third here, some dojo-y articles went up going into detail about certain aspects of the game.
There's "Stages 1," covering the stages we've seen in the demos, and only those, sadly.
http://www.smashbros.com/us/howto/entry4.html
There's "Basic Controls," which is exactly what it says on the tin.
http://www.smashbros.com/us/howto/entry3.html
And the most interesting is "Solo play," confirming the mode with the different routes and KIU style intensity slider is indeed Classic, that Target Test is very likely gone, and conveniently shows that custom moves must be unlocked.
http://www.smashbros.com/us/3ds/gamemode/entry3.html
(Will add the important pics in a moment.)