I just started playing RAAM's Shadow yesterday and one of the things I noticed right away were the high res textures on magazines in this DLC. You can even read the small letters on the bills lying around, which wasn't the case in Gears of War 3's main campaign.
When I entered the banks vault I noticed some magazines lying around. Two of them refered to The Cole Train (one of them had a list of names of developers like Cliffy B and Perry) and the other one had a Aaron Griffin in it's prime in a suit and with glasses on it's cover. It's only readable when you zoom in with your snipe
Location: The tables in the bank's vault (two magazines on the left, one on the right)
Have you found any other easter eggs or references in RAAM's Shadow? Post it here.