Back in January, tie-in Iron Man 3 toys first revealed a “Deep Space Suit” that, later, added legitimacy to a report, via Latino Review, which spoiled what the films post-credits teaser will entail. Linking it to the Guardians of the Galaxy.
According to Io9 and other sources, after the Chitauri attack,Tony Stark creates the “Space Suit” “using a unique new metal alloy that absorbs his ARC Reactor energy signature. Tony travels into the far reaches of space to find the source of a coded SOS he receives at the end of Iron Man 3. The SOS is from a masked Star-Lord, so Tony takes off to find him (noting that, with the space armor, he’s “ready this time”). Jarvis asks Tony where he’s going, replying, “I’ll be back.”
Considering it was previously reported that Tony Stark would also pop up during the Guardians of the Galaxy post-credits teaser, the above spoiler implies that Guardians will take place either before or concurrently with Iron Man 3 events on Marvel’s cinematic timeline.
Another Minor Spoiler Warning
What happens in Guardians of the Galaxy that’ll prompt Star-Lord to ask for Iron Man’s help, while also leading up to the 2015 follow-up to The Avengers? Who knows! An Io9 user speculates that Thanos is the source of distress and Star-lord is warning Stark that the Mad Titan is coming to Earth; and this is where The Avengers sequel begins.