Just found a list of additional content on UK retailer Smyths Toys. It looks like it could be content that might be packed in with a Limited Edition version of the game.
[quote]Additional Content Includes:
- Gears 3 Epilogue # 1hr + of campaign content telling the story of Baird and Cole during the final events in Gears 3 # No Gears 3 disc required
- Newways to customize with armor skins
- Multiple new weapons
- GonD token for Gears of War 1
- 2-day LIVE Gold Trial
- Two Game Add-ons (+30/+60 days)
- 6 multiplayer maps, 2 multiplayer modes
- 2 free multiplayer maps [/quote]
I've screencapped it in case it gets removed.