A) What is it chambered in? I bet 10mm, just for the sake of simplicity. I doubt they would add another cartridge to the game.
2) What are they gonna call it? My bet is either on "Government Pistol" or "Military Sidearm"
Other) How powerful is it gonna be. One thing Josh said about not including the M1911 in the base game was how to tier the .45ACP round in with the other pistol rounds. He didn't want to make it a weak round, ala 9mm, nor make it stronger than the 10mm. But since DLC weapons seem to get a free pass on realistic balance, ie: the short barrel police pistol does a ton more damage than it's bigger .357 Revolver cousin, I think this is a way to give us a real powerful M1911, one that'd please folks like me, without having to worry so much about *why* it's more powerful than, say, a regular 10mm. I bet it will be more powerful than the 10mm, about halfway between the 10mm and the 12.7mm. Around 32 DAM, just a bit less than the .44 Mag.
-Gunny out.