While there is no
confirmation as yet regarding the Switch release
date or
specific content, both Steam and PlayStation 4 versions
of the game had a meaty trophy and achievement system which allow the player to trade in Brawl points to unlock concept art and character models.
Today's official announcement
of the game didn't make mention
of a
specific release
date or even a launch window, so there's no formal
confirmation of this, but it certainly sounds plausible.