Ok I was bored so I watch the 'Sky Captain and the World of Tommorow' trailer on my xbox. I noticed that the music in the background the stargate music (which I love) and then I googled it, check this crazy shit out...
Note: 99.9% of all trailers use un-original music for their trailers as the music for the movie has not yet been written. Van Helsing, Spider-Man 2, The Day After Tomorrow etc all use other music.
It's just a trailer. these movies are not staking any claim to the themes they use in their trailers. There will be no use of the Stargate theme tune in the movie itself.
I remember when "Warriros of Virture" came out they used the Stargate theme tune from the movie. I couldn't place the music as it was before my Stargating times, but I loved the music and wondered what it was. My friend and I were looking forward to seeing it and the music was great.
A few months later Stargate was on TV and I happened to watch a scene, the caravan to Nagada, it was then that I recognised the music from the Warriors of Virture trailer.
A bit of Trivia, Teryl Rothery was in "The Warriors of Virtue" also.

Music from Stargate has been used in trailers for the following movies:
• Dragonheart (1995) - Theatrical Trailer
• Independence Day (1996) - Theatrical Trailer
• Jumanji (1995) - Theatrical Trailer
• Lost in Space (1998) - Theatrical Trailer
• The Man in the Iron Mask (1998) - Theatrical Trailer
• Mighty Joe Young (1998) - Theatrical Trailer
• The Mummy (1999) - Theatrical Trailer
• Volcano (1997) - Theatrical Trailer
• Warriors of Virtue (1997) - Theatrical Trailer
• Waterworld (1995) - Theatrical Trailer
• Mission to Mars (2000) - TV Trailer
• Titan A.E. (2000) - TV Trailer
• Dungeons & Dragons (2000) - Theatrical Trailer
• Deep Rising (1998) - TV Trailer
• The Time Machine (2002) - Theatrical Trailer
• Spirit: Stallion of the Cimarron (2002) - TV Trailer
• Sky Captain and the World of Tomorrow (2004) - Teaser Trailer