Unfortunately, the names of the games that aren’t included yet are not mentioned in the list. It is not known if this is all they will be adding.
According to a game list for each retro library, there are at least 38 Nintendo 64 games & 52 SEGA Genesis/Mega Drive games planned for the service. Well, the datamining has already managed to discover something interesting. It is not surprising, but dataminers have already been hard at work, looking deep into the files of the updated Nintendo Switch Online to see the contents that are normally hidden away from the public. By now, you likely know that Nintendo Switch Online + Expansion Pack launched last night.