http://tvline.com/2014/07/24/agents-of-shield-season-2-avengers-age-of-ultron/

Specifically, how will it affect Agent Coulson?
Read more at http://www.hitfix.com/tv-tattle#cvcG3wOPBwAOljYt.99

http://www.cinemablend.com/television/Why-Avengers-2-Trailer-Leak-Disaster-Agents-H-I-E-L-67990.html

Marvel never made it clear if they would be sneaking an Avengers 2 trailer anywhere else in the meantime, only saying it would be a TV debut during Agents. Marvel Cinematic Universe fanatics were already going to be tuned into Agents of S.H.I.E.L.D. on Tuesday night anyway, but less intensive superhero fans now have little to no reason to watch the show if they weren’t already invested in it. It’s impossible to negate how important roping the casual fanbase in with this trailer was for ABC, as an Avengers 2 trailer would even have brought mass audiences to Fox’s Mulaney. But it’s now all basically a moot point, since the trailer is already out there.

It’s not assumed that the leak will actually diminish the audience that Agents of S.H.I.E.L.D. already had, but it’s an audience that has been gradually declining since the show began, even without a disaster like this happening. The first season averaged over 8.3 million viewers for its duration, with peak results for its series premiere, which brought in over 12.1 million pairs of eyes. But its second season has been far less successful, averaging just 4.9 million viewers through the first five episodes. Considering the seemingly infinite number of people going gaga over the Avengers: Age of Ultron trailer right now, I have to assume that many millions of potential viewers were lost. Here’s how Marvel reacted to the leak.