I agree, it will likely be busier. That said, it will be busier with people going to see EE, so a good percentage of the 'extra' guests will be standing in that particular queue!
Brilliant idea for WDW! Calling out the AP's for the preview to help a normally slower period. We will be in attendance (by sheer luck!) so I guess I'll plan on bumping a few more elbows! I'll happily hop in line for my turn!