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Good to note that if you add a new piece of content to the top of a stream, members in the stream will actually get that new content in the next cast, but if you put it below in the stream, they have to get through the top emails before receiving it. So may be quickest to just add the new content to the top of your stream, let the audience receive it, and after, they go back to where they were in the stream. Also, if you nest your email in a smart campaign in the program tracking asset consumption, Marketo is smart enough to look at program membership and not send the email to someone who is already a member of the program that the email lives in.
Let me know if you'd like me to point you to some documentation related to the latter here.