Famitsu, as the publisher of their newly announced Re: Final Fantasy XIII DVD, have posted an article on their site clarifying what will be contained on the DVD. It turns out the DVD will be 50 minutes long, not 60 like earlier thought and will contain trailers for Final Fantasy Versus XIII and Final Fantasy Agito XIII too. All of the trailers were shown privately at DKS3137 except for Agito which was shown privately at last years Jump Festa. None of these trailers have been officially released to the public. Interestingly there is no mention of the TGS08 Final Fantasy XIII trailer and gameplay that was brought up yesterday.

The DVD also has lots of footage from other Square-Enix titles. The full list of trailers and the events they were shown at is below.

Final Fantasy XIII [DKS3713 Trailer]
Final Fantasy Versus XIII [DKS3713 Trailer]
Final Fantasy Agito XIII [JUMP FESTA 2008 (2007.12) Trailer]
Dissidia: Final Fantasy [TGS2008 Trailer]
Final Fantasy VII: Advent Children Complete [TGS2008 Trailer]
Kingdom Hearts 358 / 2 Days [TGS2008 Trailer]
Kingdom Hearts Birth by Sleep [JUMP FESTA 2008 (2007.12) Trailer]
Kingdom Hearts Coded [DKS3713 Trailer]
The 3rd Birthday (The Third Birthday) [DKS3713 Trailer]

Thanks to our forum member lux for finding it.
Source: Famitsu.com