So... I don't think they'll just reuse Gen 8 spirits for the spirit board if it happens. Sure it happened with Ninjara and Ribbon Girl, but they were only summonable prior to this, not fully fledged battles. So basically, it was all new stuff anyways, so the SWSH board might just all be new things.
But if they can afford to have all new spirits, then that'll be it.
What is everyone expecting from tomorrow? Is whatever new they show really going to be a "big project" as they said?