User blog comment:SarcasticSenseofHumor/Final Seven and First Out Confirmed?/@comment-1441098-20130909211826/@comment-1874924-20130910022539

The thing to keep in mind as far as F7 speculation and the like is that a group shot isn't necessarily going to show everyone who is still in the game at that point. As for possibly spoiling the first out, that's not a particularly big spoiler and early TD promos have spoiled bigger things before, most notably Duncan's return and hookup with Gwen in Season 3.

By the by, it's techinically a promo and not a commercial. A commercial is where a station advertises someone else's goods or services. A promo is where a station advertises its own programming.