Since he was the main sim in the trailer and really popular, I am almost 100% positive he would be in the game. Not sure if he would be in the household or not; but should still be playable. Only a few sims in trailers and all that are not playable at all or in the gallery at all (not even in Maxis's gallery). Like that one sim in Stangerville that sales items is in the game and you can befriend him; but he doesn't show up with other sims when managing them. And a few a few vampires weren't in Maxis's gallery; but most were.
I don't think you have too much to worry about as he should be included.