The song is "Freedom Fighters (Choir)" by Two Steps From Hell. It's a very nice tune
As for the delay, it was inteden for last Christmas, it was even ready but was delayed due to the effects of last years writers strike. Paramount simply had a gap to fill in May. Same thing what happened with the new Harry Potter movie.
Oh and for anyone who REALLY wants to talk about Trek, Sci-Fi or TV in general, go join trekbbs.com. I've been a member there for six years plus and it's a great community.
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"Fifty years from now, when you're looking back at your life, don't you want to be able to say you had the guts to get in the car?"