Wouldn't mind seeing the new AT-DT make an appearance at some point.
I know it's just another walker, but it could feature a really interesting mechanic for the game.
In campaign, I could see this:
Aerial Deployment: When you deploy the AT-DT, you may choose to deploy it to any exterior space on the map.
In Skirmish, this:
Support Deployment: You may choose to wait to deploy the AT-DT until the start of the second Round. If you do, you may deploy it to any space within 3 spaces of one of your units.