Michael Barrick, a key character from the Gears of War graphic novels looks to be the star of some DLC for Gears of War 3.
Cliff B, GOW3's producer dropped into NEOGAF's forum with this in response to a question:
'No, it won't be the graphic novel, but it will have all new campaign content that doesn't have Marcus, Dom, Cole and Baird in it. Expect Barrick and more...'
That is to say the DLC features Barrick but is not going to be a retelling of any prior Gears storyline.