Did he say this "sign" suggests the Rapture or the 2nd Coming of Christ?
If he did, I missed it.
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Even Jesus told us their would be "signs in heaven" meaning solar eclipses, lunar eclipses, and "special" configurations such as this one that is described in Revelation 12:1.
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Many people consider the re-birth of Israel in 1948 as a "sign."
Ditto with Jerusalem in 1967.
And this particular "Revelation 12:1" configuration, if it is correct, was last seen 5,900+ years ago (according to their astronomy computer programs). 
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It's just another "sign".....along with everything else that has been going on recently....to let those who believe....understand....that the time draws closer every day.