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The rumor isn’t delivered as a “scoop” but a “rumor,” so take it for what it’s worth — and it’s delivered via el Mayimbe’s personal Twitter account, rather than via the site itself (you can see it below).
HOT #SDCC2014 RUMOR! The DC/Warners panel will show a hot clip from BATMAN v SUPERMAN: DAWN OF JUSTICE. FIND SPOT @ HALL H line NOW! RT
— Umberto Gonzalez (@elmayimbe) June 22, 2014
Still, the film could easily have some footage ready to debut — especially if it were to be something not particularly effects-heavy like a meeting between Superman and Batman, Batman and Lex, etc., that could take place on the ground and without major sci-fi action. Last year Fox had a pretty significant presence for X-Men: Days of Future Past even though the film had been shooting for only a few weeks.