Samurai Shodown IV will play in english no matter what, as Snooptalian said.
Master of Syougi, all the quiz and mahjong games, and basically any game that did not have a US mvs release, will be japanese only.
As a side note, the soccer games have more languages on option than any other type of game on the neo (something like 7), which tells you something about the market for arcade soccer games up through 1996.