Larry Hyrb shared on his Twitter feed that 8 new games have joined the Xbox One backwards compatibility list.  Among them are the Obsidian developed Fallout: New Vegas.  Also joining the lineup of backwards compatible games is a diverse set of Xbox Live Arcade titles.  The full list of new games is:

• Fallout: New Vegas
• Red Faction: Battlegrounds
• Joe Danger Special Edition
• I Am Alive
• Dungeons & Dragons: Chronicles of Mystara
• Crystal Quest
• Comic Jumper
• Blood Knights

You can find the full lineup of backwards compatible games here:  Xbox One backwards compatibility list