Here’s a promo video for season 4 of Heroes called “Redemption” (perhaps alluding to what the show needs). While the actual promo looks pretty interesting, I’m not holding my breath for this to be any good. Perhaps I will be pleasently suprised, but give Heroes track record and the fact Bryan Fuller left…again, I doubt it.
Also, with almost any footage, a skilled editor can make something look good. For example, the trailers for Terminator Salvation made the movie look great and a sure hit. Unfortunately the trailer was much much better than the movie.