The only incomplete and/or unfinished neogeo unreleased game that has ever surfaced was the recently discovered Dragon’s Heaven fighting game. None of the other titles would need any amount of “finishing” or even “polishing”.
But obviously, they could have made the announcement with better clarity. They likely chose to keep it vague on purpose because it helps to hype up interest and increase the mystique. Any simple localization or region change of an already released game is anti-climactic and they should know better.
Either way, I’d really like to know just how anyone or even any company can obtain the IP for any unreleased game from the former SNK when the current SNK is 80% owned by a Chinese company. (and that’s even assuming they acquired those IP’s and, more significantly, that the actual materials needed to assemble them are even still there.)