The Cimarron Group, the company behind Twilight’s marketing, has a list of DVD bonus features that might be included on the DVD.  (Thanks to B&E for the info).  You can see their list of extras here!

DVD Extra Content & Blu-Ray Features:

-Becoming Bella
-Becoming Edward
-Music: The Heartbeat of Twilight
-A Conversation with Stephanie Meyer
-The Adverture Begins: Twilight’s Journey – From Page to Screen
–The Beginning
–The Partnership: A Look At Pre-Production
–Vampires
–Capturing the Action: A Look At Production
–Vampire Baseball
–The Final Word on the Final Battle
–Putting It All Together: The Magic of Post-Production