Website Nuke The Fridge has posted "spy photos" from the Guardians of the Galaxy set, and they appear to feature tanks and trucks that have the S.H.I.E.L.D. logo on them.
We have heard rumors that S.H.I.E.L.D. would be in contact with the Nova Corps in the film, but now we have some confirmation, given that these photos are truly from the Guardians set. S.H.I.E.L.D. could also show up to clean up the spaceship crash.
Guardians of the Galaxy is currently undergoing reshoots right now at Walt Disney Studios in Burbank, CA. If these are from that set, they could possibly be adding S.H.I.E.L.D. to the film to give a further connection to the rest of the Marvel Cinematic Universe. Head on over to NTF for the rest of the photos.