Yeah, it's called 'Becoming a Spartan.' I wouldn't expect to see battle in the trailer.
I kind of dig it. I mean, he looks small, sure, but it's not like he's suiting up yet! Also, Carter is a s3. They were human before they were Spartan, right? The S2s were the ones created pre-birth and grown accordingly, weren't they? And maybe that's just the first run of shots. You kind of see his muscles bulge during that whole sequence... Maybe it's a process!
In any regard, I'm still anticipating that longer HD one. I know it's supposed to be an XBL exclusive, but that's not an option for me right now. =