I'm thinking of a civ reveal similar to when they were at PAX before release. They announced that they will show a civ to the audience of the show, but the worldwide public will have to wait some more time until the First Look video gets released. Of course, we knew before the video release that it was Kongo that was shown in the PAX show. Maybe it will be the same with E3? They'll announce this or next week that the two new civs or one of them will be shown to the audience at E3 and the First Look will be up as soon as E3 is over.