There will be different levels of penthouses, just like we have different levels of houses now. I think by "penthouse" they just mean it will be at the top of a tall building.
That was my point, though. There is absolutely nothing stopping anyone from making a tall building (either using the in-game restriction of five stories, or making it higher using one of a dozen methods), leaving the bottom stories completely empty, and just furnishing the top story. Voilà! Penthouse "apartment". You could literally do this with the base game, no EP's, no SP's, no CC. The only thing that comes with
Late Night that could possibly make that scenario better is an elevator.
So I'm just wondering if that's what EA has done, or if there's more to this "apartment" thing, something closer to the
Apartment Life EP from Sims 2. Of course, no one can answer that question until they release more info. I'm not expecting anyone to, or even complaining. I was just pointing that out.