The cast has been in rehearsals for three weeks and I believe they've starting laying down the music tracks (the performers obviously will be lipsynching to backing tracks in the filming). Perhaps, they'll use one or more of the prerecorded songs for the trailer.
As for the Tony clip, one can now understand why Breglio and Geffen have been so protective of everything associated with Dreamgirls for years. They wanted to treat the show as something very special and not just any old Broadway musical. This is why they stopped Broadway Treasures from using either the Dreamgirls or the A Chorus Line Tony clips and why Breglio makes it all but impossible for anyone to view the video of the show at Lincoln Center.
Now with the movie coming out, they've offered to pay the licensing fees for any amateur group out there who wants to do the show, trying to encourage as many productions as possible and create a buzz for the film. I imagine the famous Tony clip is going to pop up at some point as well, perhaps as part of some tv special promoting the film.
"What a story........ everything but the bloodhounds snappin' at her rear end." -- Birdie
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"The Devil Be Hittin' Me" -- Whitney