Star Citizen is huge, so we're scratching the surface with what has been shown to us so far. The below link is a list of ships as yet unseen in the game, collected either from Lore Builder, Jump Point or the accompanying fiction (keep in mind that they have said that Jump Point and the fiction has a fair number of factual nuggets embedded in it).
Well worth a read to see what might be released in the future.
https://forums.robertsspaceindustries.com/discussion/77361/list-of-unseen-ships/p1