1)
Yes for the first question. That's passive. And no for the second question. That interpretation is possible if the first sentece is not there. However, the flow of the context shows that the topic is still あなたたち also in the second sentence, so it's natural to interpret 姿をみられたかもしれない is talking about あなたたち, as in あなたたちは姿をみられたかもしれない.
2)
番組 / 放送をお送りします
we'll send you a program.
3)
Yeah, that's right. の must be a typo.
4)
because