Told ya, dude.
And the guy at the end talking to Thanos is listed as "The Other" in the credits, and he was played by Alexis Denisof from Buffy and Angel. It kind of surprised me when I saw his name.
No idea if he's a Skrull or not, though.
As for Coulson, I've seen some people saying that both Whedon and Gregg have stated that Coulson didn't die. It would be in character for Fury to make them think he did to bring them together, but I dunno, he looked pretty dead to me.
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Gamertag/PSN-Murphiroth
"Would have liked to run tests on the seashells..."