In searching for something else I've found online that the generally accepted version of the post-credits sound is:
Spoiler:
it is reversed audio and when you reverse it back it clearly says "it's still alive." Whether that was Rob talking or audio from a nearby walkie talkie (and thus staticky) seems debated. You can hear the audio reversed here. The sequel implications are even stronger and I dislike it for the same reasons stated above.
Quote:
Originally Posted by BarTopDancer
Spoiler:
After hearing it again, I would agree with that assessment. However, in the theater about 10 of us all hear "now what". I also don't recall the vocal part of the clip being longer than 2 words. "It's still alive" is only 3 words. Either way, it's open for a sequel. I'm still hung up on the lack of a conclusive ending, and I hope that any sequel does answer those questions I want to know. But as BE pointed out last night, I think I really want to know because of the unanswered questions of Lost. Which isn't fair to the movie (which I did enjoy)
OK, I am quoting myself because if Alex's link is correct, then it is much more conclusive then what i thought it said.