From the most recent patch notes:

After the Confederate collapse at Fox's Gap earlier in the day due to the attacks by Union Maj. Gen. Reno's IX Corps, CSA Brig. Gen. Hood now orders his division south to relieve the battered Confederate lines in an effort to regain a foothold at the gap. To deny the Confederates the chance of doing so, the 51st New York and Pennsylvania are sent forward with the Corps commander in close proximity in order to inspire his troops and inspect the lines.
That'd look nice on the loading screen (and maybe the f2 map) for the battle, along with perhaps a 2D/symbol battleplan and historical photographs and maps. In a series of screens. Which would give people something to learn while waiting to load in, and also a bit of familiarity with what's expected of them during battle. Could even pop in bumph about the units too.