I'd say it's open to interpretation, aka we're going to make bank off of you in the potential sequel.
All I know is, Juno was looking good.
*EDIT* On the whole final scene thing:
Dileep Rao offered further insight, advising viewers to pay attention to the scene in an unusual way. "You know what, I'll just say this: Use your ears not your eyes."
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http://www.mtv.com/news/articles/164...14/story.jhtml