Thor's Chris Hemsworth spoke with MTV News at Sundance about the "incredible" The Avengers script:

"Everything about the story and the comic books is huge. You have these huge, big superheroes and huge, big egos crammed into one small space," Hemsworth said. "Reading the script, it was massive. Everything about it was like, 'Oh my god.' I said to Joss, I said, 'I don't know how you're going to shoot this thing [laughs], but I'm excited to be onboard and let's give it a go."
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Asked about whether Jeremy Renner will cameo in Thor:

"I don't know if he's in 'Thor.' I haven't seen the cut yet, and he wasn't on set when I was there, but he may be in the final one," Hemsworth said with finality. "He's certainly in 'The Avengers.' I had a chat with him at Comic-Con and he's as excited as the rest of us."