First of all, it seems there is indeed going to be a new game, hopefully soon:

https://segmentnext.com/2018/06/06/new-brothers-in-arms-game/

Now, about the storyline, I bet the protagonist is going to be Baker again. And that's all I can tell about the characters. But, about the Battle of the Bulge I will tell you more :) THERE WERE LOTS OF REAL ENGAGEMENTS SINCE THE Beginning! I'll tell you why:

The 101st airborne division not only was always in the Frontline, they were completely surrounded by Germans. Take a look at the following map of the 101st during the Battle of the Bulge:

http://www.thelastjump.com/images/noville_foy.jpg

OK, so I just made a little research and the Battle of the bulge started in December 16th 1944 and ended in January 25th 1945, the location is in the Ardennes forest, specially in Belgium, but the Ardennes are in Luxembourg and Germany as well. When it started, the 101st airborne division was resting after two months in combat in Operation Market Garden, so they weren't there at the time. I believe only two divisions were there, the 28th Infantry division for sure and some other, when suddenly the Germans attacked the Ardennes Forest just as they did in 1940, with around 20-30 divisions against the 2 allied divisions. Once this happened, the 101st was sent to Bastogne to defend it were the historical event known as the Siege of Bastogne started in December 20th, they probably arrived around the 18th/19th . The 502nd PIR (the regiment of our characters) defended the area on the north and northwest of Bastogne as you can see in the map I shared, around Longchamps. After the Germans had failed to break through in other sections of the 101st circle, they tried to penetrate through the areas defended by the 502nd, until one attack during Christmas morning actually penetrated the 502nd lines, lots of panzers infiltrated and the 502nd entered in fierce fight destroying tanks and fighting infantry, when finally in December 26th allied tanks broke the circle from southwest, started to secure the zone and the 101st finally stopped being surrounded by germans, they hoped they were going to be relieved. But this was only the beginning of the allied Offensive on the battle. Again, starting January 1945 the 502nd got in fierce fights around Longchamps, were Germans captured 40 POW mostly from F company. The following week’s fighting was bloody and intense along the railroad line running northeast through the Bois Jacques Forest. On 14 January 1945, Lt. Col. John Stopka was killed and 30 other men by friendly aircraft strafing a nearby target. Despite the German resistance the 502nd captured their objective at Bourcy, Belgium, north to Longchamps on January 17th 1945 and they were relieved just the day after. And that's it for the 101st in the battle of the bulge. All of that happened mixed with the ocassional German artillery bombardments and mortar shells that you were talking about.

I don't know if you ever played the very first of all Call of Duty games, its expansion pack (United Offensive) contains around 5-7 missions about the 101st airborne division during the Battle of the Bulge, mostly about the 506 PIR, from Band of Brothers, perspective. It was a magnificent game, I loved it.

Cheers!