Not aware of it if there was and I've never seen it enforced when leaks of DLCs, Halo 4, and Halo CEA were shown around on 'GAF and the likes.

I come from the Sonic fanbase, SEGA can't keep a secret for shit so were always getting leaks. its sort of second nature to just post whats available.

: Well, the lack of context on the cinematic teaser can lead people like myself
: to jump to conclusions!

: For example, if the final cinematic of the game cuts to Lord Hood and then
: maybe back to the Chief, well, I think it does a lot to ruin the feel for
: the final cinematic of H2. Showing Lord Hood really serves no purpose, you
: know? In the original, we see the ship enter Earth's atmosphere as chaos
: ensues all around. There's static and conversations all over. We're
: hearing this from Master Chief's perspective and from his helmet. The
: focus is on him. Why? He's on board. He's back at Earth. We're finishing
: this fight (sort of). Showing off flashy CGI while detracting from the
: subtext and writing of the scene just to show off flashy CGI is, in my
: opinion, pointless.

: Then again, it may just be a teaser designed to excite and entice! Maybe it
: won't make it into the final version of H2A! Who knows! Not me. Not
: anyone, really. We aren't supposed to have seen this yet. But hey, I would
: have said it in the future, so why not now? Now I don't have to care about
: it again, and I won't be surprised when they go screwing (in my opinion)
: with the cutscenes (if that's what they do).

The latter is what it is most likely, from what I can gather from that Lord Hood scene + the screenshot 343i released on the site it was made just for the intro seeing as godrays are in the background while hes talking. I'm betting most of those scenes were made for the intro.