Yes, what is apparently just a Super Bowl commercial is considered important enough to warrant a teaser trailer. Unless, of course, they really ARE making a sequel (probably not.)
I have what you'd call a "complicated" relationship with "Ferris Bueller's Day Off." On the one hand, it's hard to ignore that it's a movie that essentially treats a narcissistic semi-sociopath - who "get's over" on anyone trying to keep him from doing whatever he wants even though he's a priviliged upper-middle-class white suburban kid who could easily do all the things he's conning his way into WITHOUT the conning part - as a kind of aspirational role-model. On the other hand... maybe it's because I TOO was a mostly-comfortable middle-class suburban smartass when I saw it and really did identify with him. Either way, it's still a fun movie.
Also, something just occured to me: If you took the original film and did some digital-trickery to all of Ferris' fourth-wall-breaking moments so that it looked like he was talking into his webcam/smartphone... it would essentially play out like an ULTRA up-to-date movie about teenagers in the youtube/facebook oversharing age. That's how cool Ferris was - he was VLOGGING HIS LIFE two whole decades before "Vlogging" was invented.