While I love the Ady's new footage, I'm not sure I like the idea of seeing more walkers get destroyed. I know that the new stuff is added to account for continutiy issues of why we only see a few walkers later on, but I worry that seeing the rebels take out more AT-ATs will make the battle seem more evenly matched. The battle is supposed to be really lopped sided. the rebels in the trenches are sacrificing themselves to buy time for others to escape. This is really the only time we see the Empire's truly superior forces. The audience is supposed to feel that the rebels will not be able to make it out.
Perhaps a solution is to have more AT-AT's in the background so you know wellthat there are a lot more AT-AT waves coming and there is no way the rebels can defeat ALL of them.